CHUWI Hi9 Air 64GB MT6797 X20 Deca Core 10.1 Inch 2K Screen Android 8 Dual 4G Tablet

My Chuwi Hi9 Air is running the _____ ROM?


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uncleabubear

Senior Member
May 1, 2014
311
165
73
London
CHUWI Hi9 Air 64GB MT6797 X20 Deca Core 10.1 Inch 2K Screen Android 8..0 Dual 4G Tablet

Specifications

Model CHUWI Hi9 Air
CPU MTK6797 Helio X20 Deca Core 20nm
A72*2 2.3 GHz
A53*4 1.4 GHz
A53*4 1.85 GHz
GPU ARM Mali-T880 780MHz
System Android 8.0
RAM 4GB DDR3
Capacity 64GB EMMC
Screen 10.1 Inch IPS Capacitive Screen
Resolution 2560*1600
299 PPI Pixel Density
OGS One Glass Solution Fully Laminated
Camera Front is 5.0MP Rear is 13.0MP
Microphone Built-in
Speaker Built-in
WIFI 802.11 a/b/g/n/ac(support 2.4GHz and 5.0 GHz)
Bluetooth 4.2
GPS Support
G-sensor Support
Brand(Network)
GSM: (Please see pictures below)
WCDMA: (Please see pictures below)
LTE:1/2/3/4/5/7/8/12/17/20/28/38/39/40/41
OTG Support
TF Card Support (Maximum support 128G)
Audio AAC,AMR,MP3,OGG,WAV,ACC,M4A,FLAC
Picture JPEG,GIF,BMP,PNG,JPG
Video 3GP,AVI,MKV,MP4,M4V,WEBM,MPEG4
Language Multi-language
I/O Port 1 x Micro USB port
1 x 3.5mm Earphone port
1 x TF card slot(Max Support 128G)
2 x Micro SIM Card slot
Battery 8000mAh
Weight 550g
Size 241.7*172*7.9mm

In Box
1 x CHUWI Hi9 Air Tablet PC
1 x USB Cable
1 x Charger
1 x Adapter (the adapter depends on the country of the buyer.)


Home page https://en.chuwi.com/
Image of Front
attachment.php

Image of Back
attachment.php

Image of Buttons
attachment.php


Videos
Chuwi Hi9 Air, Unboxing, Review, Gaming and Root https://youtu.be/6jnJSHE5lck
00.00 Unboxing from Banggood
02.04 Throw away screen protector
02.58 Fitting Sims and MicroSD
04.03 Powering On
04.40 Screen
05.48 Android 8.0.0
06.15 System Update
06.27 Factory Reset
06.57 UI Stock Android
07.47 Gapps including Play Store
08.26 Uncertified Device
08.51 Brightness not adjustable (Solved) https://forum.xda-developers.com/showpost.php?p=76505791&postcount=22
10.13 Battery
10.46 Build Quality, dimensions and thickness
12.14 4G/LTE Bands
13.36 Phone Calls
14.36 Whatsapp
15.13 Cameras
15.35 Boot Safe Mode
16.29 Haptic feedback supported
16.46 Photo and video quality
17.58 GPS
18.17 Wifi
18.41 Teamviewer supported
19.07 Benchmarks, Ice Storm, Geekbench, Battery,
20.26 Antutu
20.40 Androbench eMMC
21.00 Treble
21.47 Stock Apps
21.52 Large PDF performance
22.32 Web browsing
23.13 Thermals and reboots
23.50 Gaming, Asphalt 8
24.59 Pubg
26.04 Conclusion
26.58 Root


Review by @Alberto96

How to Update
Android Security Updates go to Settings >System >System Update >Check for update
Wireless Update (OTA) go to Settings >System >About Tablet >Wireless Update >Check for updates >Download >Install now >OK and System reboot.
Backup NVRAM/IMEI http://www.anythingultimate.in/2015/11/how-to-backup-your-nvram-partition.html

Downloads



How to Flash Stock Rom
Download and extract stock ROM
Download and extract flashtool and install mtk driver (disable driver signature enforcement)
Get rid of any chinese characters in directory names
Download da file to flashtool directory
Open flashtool and open da file and open scatter file in stock ROM directory
Click download
Plug in powered off tablet
Wait for ok

Flash not working? Troubleshoot
Ignore any errors
Use flashtool in link
Get rid of any chinese characters in directory names
Open and close flashtool a few times before you click download
attachment.php


How to Root
There are three ways to root.
1. Install twrp then install supersu with zip.
2. Install twrp then install magisk with zip.
3. Flash magisk modified boot.img.
How to install Twrp https://www.xda-developers.com/how-to-install-twrp/
TWRP Custom Recovery created by @Alberto96
SuperSU Download SuperSU TWRP Zip
Install supersu or magisk with zip file using twrp> install

Magisk https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445
Download Magisk TWRP Zip
MTK Drivers and ADB required
How to install magisk with modified boot.img ;
Backup your data, tablet will be wiped
download patched_boot.img Stock Rom Build number O00623 release-keys 20180506
OR patched_boot.img Stock Rom Build number O00623 release-keys 20180604
OR patched_boot.img Stock Rom Build number O00623 release-keys 20180809
to adb directory in PC
enable developer options, settings, system, about tablet, build number, tap until developer
connect cable to pc
settings, system, developer options, enable oem unlocking
settings, system, developer options, enable usb debugging
allow usb devices
adb reboot bootloader or shutdown and then press power + volume up, select fastboot
fastboot oem unlock
press volume up (yes)
fastboot flash boot patched_boot.img
OKAY
fastboot reboot OR cycle power to reboot, erasing device is normal
restore tablet (copy your data)
Install latest Magisk Manager
run magisk manager
Check for Root with Root Checker
Your Hi9 Air is rooted with Magisk!

Time to Boot 30s

Available space first boot 56.5 GB
7.47/64 GB MB Used
Pre-installed bloat NONE!

How to take a screenshot
Press Power + Volume Down at the same time.

Support. Install latest build before requesting support.

How to enable Split Screen
Open two apps
Tap and hold android menu or overview button, select second app
You can drag the middle point

Apps tested and working
Advanced Power Menu [ROOT]
Buffer
Control Screen Orientation
Duo
Find My Device
Fitbit
GMD Immersive (hides soft keys)
IFTTT
MacroDroid
Mr. Number
Netflix (qHD 960x540)
Open Camera
Phone Check
Prey
Rolo
Shazam
Signal
Skype
Uber
Waze
Whatsapp
YouTube (Up to 1440p)



Accessories
Cases

Benchmarks
Antutu Pass 1
attachment.php

Antutu Pass 2
attachment.php

3DMark Ice Storm Extreme and Sling Shot Extreme
attachment.php

Geekbench Single Core
attachment.php

Geekbench Multi-core
attachment.php

Geekbench Compute
attachment.php

Geekbench Battery
attachment.php

Androbench (Storage Benchmark)
attachment.php

GPS
attachment.php

Home Screen
attachment.php

Teamviewer
attachment.php

Wifi
attachment.php

2G/3G/4G/LTE Cat 6 Bands (Support for LTE:1/2/3/4/5/7/8/12/17/20/28/38/39/40/41)
attachment.php

attachment.php

Stock Apps
attachment.php

Treble Supported but A-System partition only
attachment.php

Battery Performance Normal Use 7-8 hours
attachment.php


Updates
09/04/2018 I Ordered / pre-ordered
13/04/2018 New video
06/05/2018 Received my Chuwi Hi9 Air yesterday Saturday 05/05/18
10/05/2018 Review posted to youtube see above
11/05/2018 More pictures and info
25/05/2018 Link to cases
04/06/2018 Added links to downloads
05/06/2018 Added how to flash, how to install magisk and updated known issues
18/06/2018 Added alternate download link and updated known issues
20/06/2018 Added TWRP
01/09/2018 Added links to Build 20180809
03/11/2018 Added O00623 release-keys 20180905 Update Bugs
08/11/2018 Download OTA 20181010
28/11/2018 Download 20181122
28/11/2018 All CHUWI tablets with Helio X20, X23, X27(or higher verison) will be updated to Android 9.0 in 2019
14/02/2020 New link to download twrp
 

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Last edited:

uncleabubear

Senior Member
May 1, 2014
311
165
73
London
Chuwi Hi9 Air is sold exclusively by Banggood.
They sent out the following message today.

Dear customers,
Thanks for choosing Banggood and our products.
We’re sorry to inform you that the preorder for the item [Original Box CHUWI Hi9 Air 64GB MT6797 X20 Deca Core 10.1 Inch 2K Screen Android 8 Dual 4G Tablet] was delayed due to a delay in the manufacturing process.
We’re will do our best to find a solution as soon as possible.
If you don't have the urgency to receive the product, and can wait for your order, after the delivery, you will also receive Banggood Points in your account.
The amount of Banggood Points will be calculated as following:
Less than 7 days delay: 50 BG points
More than 7 days delay: 100 BG points
In case you do not want to wait for the delivery and want to request a full refund of your order, please click on the following link:
https://www.banggood.com/index.php?com=account&t=ordersList
Thank you for your understanding and your cooperation.
Best regards,
Customer Service.
 

uncleabubear

Senior Member
May 1, 2014
311
165
73
London
Chuwi Press Release http://en.chuwi.com/news.html

Dear Loyal Customers,
Thank you so much for preorderlng our Hi9 Air on Banggood, please note the price will go back to the suggested retail price of $239 soon.
Congratulations to our dear customers who pre-ordered on Banggood, because you are the first ones to experience the Hi9 Air with Android Oreo.
Our production lines are fully in operation due to the high demand of Hi9 Air, however, we're still a little bit behind schedule as promised.
We want to deliver you the perfect using experience while keeping our strict quality control of every piece of Hi9 Air.
All the pre-orders of Hi9 Air will be delivered to Banggood in a week and start to ship to your front door on 28th April.
We highly appreciate your support and patience.

Sincerely Chuwi

19th April 2018
 
Last edited:
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7inchTab

Senior Member
Jul 20, 2012
59
5
28
Still b/o for me ?

Well, my order from 4/15 still on b/o as of today. Hoping for any cell connectivity since the band 4 "disappeared" from earlier announcements! I travel a lot so should be good in row.

Currently running row ROM on nvidia shield tablet but battery life has become terrible in the last few updates. At least it gets hspa+ in USA and LTE elsewhere on the planet. And the big + was never had to wait on ATT to bless an update!

Going to use this Chuwi to replace a pipo m6 pro w/custom rom Itravel with.

Let us know all about it as soon as you get it!

Edit: Now they say shipping 5/15.....maybe I should get interest on the cash I gave them 4/15.....???
Will hold tight. I have time to cancel if the first hands on reviews are terrible!
 
Last edited:

uncleabubear

Senior Member
May 1, 2014
311
165
73
London
Chuwi Hi9 Air, Unboxing, Review, Gaming and Root https://youtu.be/6jnJSHE5lck
00.00 Unboxing from Banggood
02.04 Throw away screen protector
02.58 Fitting Sims and MicroSD
04.03 Powering On
04.40 Screen
05.48 Android 8.0.0
06.15 System Update
06.27 Factory Reset
06.57 UI Stock Android
07.47 Gapps including Play Store
08.26 Uncertified Device
08.51 Brightness not adjustable (Solved) https://forum.xda-developers.com/sho...1&postcount=22
10.13 Battery
10.46 Build Quality, dimensions and thickness
12.14 4G/LTE Bands
13.36 Phone Calls
14.36 Whatsapp
15.13 Cameras
15.35 Boot Safe Mode
16.29 Haptic feedback supported
16.46 Photo and video quality
17.58 GPS
18.17 Wifi
18.41 Teamviewer supported
19.07 Benchmarks, Ice Storm, Geekbench, Battery,
20.26 Antutu
20.40 Androbench eMMC
21.00 Treble
21.47 Stock Apps
21.52 Large PDF performance
22.32 Web browsing
23.13 Thermals and reboots
23.50 Gaming, Asphalt 8
24.59 Pubg
26.04 Conclusion
26.58 Root
 
Last edited:

uncleabubear

Senior Member
May 1, 2014
311
165
73
London
Wireless Update (OTA) (Latest 20180507-1856 Minor bug fixes) Settings >System >About Tablet >Wireless Update >Check for updates >Download >Install now >OK and System reboots. (Screen brightness bug not fixed)
 
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7inchTab

Senior Member
Jul 20, 2012
59
5
28
an update!

Wireless Update (OTA) (Latest 20180507-1856 Minor bug fixes) Settings >System >About Tablet >Wireless Update >Check for updates >Download >Install now >OK and System reboots. (Screen brightness bug not fixed)


Well, if I should ever receive mine I am glad to see they may update a few things! Ordered 4/15 still not shipped. Thanks much for your unboxing on YT. Hopefully the updates won't disable any wifi or cellular bands!
 

Palm Trees

Senior Member
Dec 9, 2016
723
311
63
Chuwi Hi9 Air, Unboxing, Review, Gaming and Root https://youtu.be/6jnJSHE5lck

You say in the video that there will be no custom rom flashing due to A-Only, how does that correspond with the fact that A-only system.imgs are available?
AOSP: [https://forum.xda-developers.com/pr...development/experimental-phh-treble-t3709659] RR: [https://forum.xda-developers.com/pr...pment/resurrection-remix-phh-treble-t3767688]

And is the Android Security Patch updated in the new OTA?
 

uncleabubear

Senior Member
May 1, 2014
311
165
73
London
Well, if I should ever receive mine I am glad to see they may update a few things! Ordered 4/15 still not shipped. Thanks much for your unboxing on YT. Hopefully the updates won't disable any wifi or cellular bands!

I checked, all the bands are still there! The LTE is apparently up to cat 6.
 

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  • 1
    Thanks for the link, I'll look into it. First I want to attempt repartitioning so I can get larger system partition for newer GSI's. Fingers crossed 🤞

    Wow, yes, good luck! I hope you are successful, share the results with us! 🙏
    I don't know if you're using Linux, but I've made a shell script to remove vndk libraries other than the selected one (in our case, vndk-26) in Android 11 GSIs, it helps to reduce the system image by a few hundred megabytes. It works well in Linux Mint 20 😁

    Thanks for feedback, I haven't tried TWRP flashing, this zip was just automatically generated by the boot logo tool I was using.

    Since you flashed stock... have you seen the easter egg I put in? Hint hint... ✌️😁
    I wonder if it's possible to make it show on GSI's too 🤔

    Yes, I saw it!!! Very good ✌️👏
    It would be nice to have that in GSIs as well, a warmer welcome in these newer systems... However, it's also an add-on for stock users :)
    1
    Hi.
    What do you recommend today? What system? I still have oreo 8.0. I would like to change to a better os. :)

    For now, I'm using Lineage OS 17.1 by Andy Yan. It's the most recent Android 10 GSI, almost without bugs. The only con is that basic integrity fails in the SafetyNet test, at least for me.

    Android 11 GSIs based on AOSP have problems with deep sleep, and the ones based on Lineage OS 18.1 have issues with the front camera, it doesn't work. Otherwise, I would be using any of them.
    I'll probably send logs to Phh and Andy tomorrow, and hopefully, these problems can be solved.

    Only one thing, the front camera is upside down for me in both Android 10 and 11 GSIs, and it seems to be related to HAL3 cam2api, but I'm not sure
  • 22
    TWRP 3.2.2-0

    Fully working TWRP 3.2.2-0 (updated on the 03rd of September 2018) based on "O00623 release-keys 20180809" (August 2018 update)

    Download Folder: https://www.androidfilehost.com/?w=files&flid=281733

    ####
    ## TWRP 3.2.2-0 brief installation guide for the CHUWI Hi9 Air (Hi9Air)
    ## Developed and Written by Alberto96 (GearLabs)
    ####


    NOTE: For those who want to keep the bootloader locked, follow the SP Flash Tool guide.

    Flashing via SP Flash Tool (noob-friendly):

    1) Download the latest SP Flash Tool software for your preferred OS (Windows/Linux)
    2) Proceed as shown in my guide linked here: https://docs.google.com/presentation/d/1NJcDBkLk8zMwyv2BTqRjn2NB_ZOWKjP1fRpSVr44Oxk/edit

    Flashing via Fastboot (minor skills required):

    WARNING: If your bootloader is not unlocked already, then it is time to do it otherwise you won't be able to flash any custom binary. DO NOT untick the "OEM Unlock" option in the "Developer Options" menu after having flashed the custom recovery.


    1) Reboot into fastboot mode (using the Volume Up + Power keys combo or just by executing "adb reboot bootloader" via ADB or a Terminal on the device)
    2) Execute this command: "fastboot flash recovery recovery.img"
    3) Now you can reboot the device by executing "fastboot reboot" or by long-pressing the power button for a while

    IMPORTANT: Be sure to root your device using Magisk (recommended for SafetyNet) or SuperSU (classic and permanent) right after having installed the custom recovery (before even rebooting into Android!) otherwise, as a security feature, Android will overwrite it with the Stock Recovery thus you will have to repeat the procedure. DO NOT blame the recovery for this since you have been warned.

    // Any procedure shown here has been tested but, obviously, you do it at your own risk. If you don't mess with anything indicated above, the chance to run into issues is almost inexistent. Good luck! //

    Device Tree: https://github.com/GearLabs/android_device_CHUWI_Hi9Air
    21
    GearLabs ROM (v3 20180917)

    GearLabs ROM

    This is just a modified Stock ROM containing some improvements and fixes in order to provide the best user experience possible, until GSIs get a proper documentation to replace completely, and properly, the stock software. Basically, this is how CHUWI should have released the software by default.

    Download Folder:: https://www.androidfilehost.com/?w=files&flid=279461

    Please make sure to have the latest August 2018 Stock ROM installed on your device before proceeding.

    Install it via fastboot (fastboot flash boot boot.img & fastboot flash system system.img), remember to unlock the BL first if you haven't already. The installation process may take up to 20 minutes depending on your PC and USB connection stability, then reboot the device (fastboot reboot).
    You can install it via SP Flash Tool too if you use the original scatter file from the Stock ROM if you prefer to keep your bootloader locked.

    What has been changed/improved:
    - Pre-patched using Magisk v17.1 to pass SafetyNet even with the bootloader unlocked
    - 90% of MTK apps have been replaced with better Google variants
    - Most pre-installed Google Apps have been updated to the latest version (mid-September 2018)
    - Removed Adups FOTA updater

    Bugs:
    - None noticed, please tell me if there is any.

    Changelog (v3 20180917):
    - Fixed issues with Google Photos
    - Based on the GMS-certified August 2018 release
    - Switched to a proper Pixel boot animation
    - All sounds have been replaced with Google Pixel ones

    Feature requests that require framework modifications won't be accepted, but i am open to any possible improvement if can be made to the ROM.
    NOTE: Before you ask me, no, it isn't possible to reduce the saturation level without major modifications. I won't be touching the vendor partition neither adding any software as a workaround.
    19
    CHUWI Hi9 Air 64GB MT6797 X20 Deca Core 10.1 Inch 2K Screen Android 8..0 Dual 4G Tablet

    Specifications

    Model CHUWI Hi9 Air
    CPU MTK6797 Helio X20 Deca Core 20nm
    A72*2 2.3 GHz
    A53*4 1.4 GHz
    A53*4 1.85 GHz
    GPU ARM Mali-T880 780MHz
    System Android 8.0
    RAM 4GB DDR3
    Capacity 64GB EMMC
    Screen 10.1 Inch IPS Capacitive Screen
    Resolution 2560*1600
    299 PPI Pixel Density
    OGS One Glass Solution Fully Laminated
    Camera Front is 5.0MP Rear is 13.0MP
    Microphone Built-in
    Speaker Built-in
    WIFI 802.11 a/b/g/n/ac(support 2.4GHz and 5.0 GHz)
    Bluetooth 4.2
    GPS Support
    G-sensor Support
    Brand(Network)
    GSM: (Please see pictures below)
    WCDMA: (Please see pictures below)
    LTE:1/2/3/4/5/7/8/12/17/20/28/38/39/40/41
    OTG Support
    TF Card Support (Maximum support 128G)
    Audio AAC,AMR,MP3,OGG,WAV,ACC,M4A,FLAC
    Picture JPEG,GIF,BMP,PNG,JPG
    Video 3GP,AVI,MKV,MP4,M4V,WEBM,MPEG4
    Language Multi-language
    I/O Port 1 x Micro USB port
    1 x 3.5mm Earphone port
    1 x TF card slot(Max Support 128G)
    2 x Micro SIM Card slot
    Battery 8000mAh
    Weight 550g
    Size 241.7*172*7.9mm

    In Box
    1 x CHUWI Hi9 Air Tablet PC
    1 x USB Cable
    1 x Charger
    1 x Adapter (the adapter depends on the country of the buyer.)


    Home page https://en.chuwi.com/
    Image of Front
    attachment.php

    Image of Back
    attachment.php

    Image of Buttons
    attachment.php


    Videos
    Chuwi Hi9 Air, Unboxing, Review, Gaming and Root https://youtu.be/6jnJSHE5lck
    00.00 Unboxing from Banggood
    02.04 Throw away screen protector
    02.58 Fitting Sims and MicroSD
    04.03 Powering On
    04.40 Screen
    05.48 Android 8.0.0
    06.15 System Update
    06.27 Factory Reset
    06.57 UI Stock Android
    07.47 Gapps including Play Store
    08.26 Uncertified Device
    08.51 Brightness not adjustable (Solved) https://forum.xda-developers.com/showpost.php?p=76505791&postcount=22
    10.13 Battery
    10.46 Build Quality, dimensions and thickness
    12.14 4G/LTE Bands
    13.36 Phone Calls
    14.36 Whatsapp
    15.13 Cameras
    15.35 Boot Safe Mode
    16.29 Haptic feedback supported
    16.46 Photo and video quality
    17.58 GPS
    18.17 Wifi
    18.41 Teamviewer supported
    19.07 Benchmarks, Ice Storm, Geekbench, Battery,
    20.26 Antutu
    20.40 Androbench eMMC
    21.00 Treble
    21.47 Stock Apps
    21.52 Large PDF performance
    22.32 Web browsing
    23.13 Thermals and reboots
    23.50 Gaming, Asphalt 8
    24.59 Pubg
    26.04 Conclusion
    26.58 Root


    Review by @Alberto96

    How to Update
    Android Security Updates go to Settings >System >System Update >Check for update
    Wireless Update (OTA) go to Settings >System >About Tablet >Wireless Update >Check for updates >Download >Install now >OK and System reboot.
    Backup NVRAM/IMEI http://www.anythingultimate.in/2015/11/how-to-backup-your-nvram-partition.html

    Downloads



    How to Flash Stock Rom
    Download and extract stock ROM
    Download and extract flashtool and install mtk driver (disable driver signature enforcement)
    Get rid of any chinese characters in directory names
    Download da file to flashtool directory
    Open flashtool and open da file and open scatter file in stock ROM directory
    Click download
    Plug in powered off tablet
    Wait for ok

    Flash not working? Troubleshoot
    Ignore any errors
    Use flashtool in link
    Get rid of any chinese characters in directory names
    Open and close flashtool a few times before you click download
    attachment.php


    How to Root
    There are three ways to root.
    1. Install twrp then install supersu with zip.
    2. Install twrp then install magisk with zip.
    3. Flash magisk modified boot.img.
    How to install Twrp https://www.xda-developers.com/how-to-install-twrp/
    TWRP Custom Recovery created by @Alberto96
    SuperSU Download SuperSU TWRP Zip
    Install supersu or magisk with zip file using twrp> install

    Magisk https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445
    Download Magisk TWRP Zip
    MTK Drivers and ADB required
    How to install magisk with modified boot.img ;
    Backup your data, tablet will be wiped
    download patched_boot.img Stock Rom Build number O00623 release-keys 20180506
    OR patched_boot.img Stock Rom Build number O00623 release-keys 20180604
    OR patched_boot.img Stock Rom Build number O00623 release-keys 20180809
    to adb directory in PC
    enable developer options, settings, system, about tablet, build number, tap until developer
    connect cable to pc
    settings, system, developer options, enable oem unlocking
    settings, system, developer options, enable usb debugging
    allow usb devices
    adb reboot bootloader or shutdown and then press power + volume up, select fastboot
    fastboot oem unlock
    press volume up (yes)
    fastboot flash boot patched_boot.img
    OKAY
    fastboot reboot OR cycle power to reboot, erasing device is normal
    restore tablet (copy your data)
    Install latest Magisk Manager
    run magisk manager
    Check for Root with Root Checker
    Your Hi9 Air is rooted with Magisk!

    Time to Boot 30s

    Available space first boot 56.5 GB
    7.47/64 GB MB Used
    Pre-installed bloat NONE!

    How to take a screenshot
    Press Power + Volume Down at the same time.

    Support. Install latest build before requesting support.

    How to enable Split Screen
    Open two apps
    Tap and hold android menu or overview button, select second app
    You can drag the middle point

    Apps tested and working
    Advanced Power Menu [ROOT]
    Buffer
    Control Screen Orientation
    Duo
    Find My Device
    Fitbit
    GMD Immersive (hides soft keys)
    IFTTT
    MacroDroid
    Mr. Number
    Netflix (qHD 960x540)
    Open Camera
    Phone Check
    Prey
    Rolo
    Shazam
    Signal
    Skype
    Uber
    Waze
    Whatsapp
    YouTube (Up to 1440p)



    Accessories
    Cases

    Benchmarks
    Antutu Pass 1
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    Antutu Pass 2
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    3DMark Ice Storm Extreme and Sling Shot Extreme
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    Geekbench Single Core
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    Geekbench Multi-core
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    Geekbench Compute
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    Geekbench Battery
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    Androbench (Storage Benchmark)
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    GPS
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    Home Screen
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    Teamviewer
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    Wifi
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    2G/3G/4G/LTE Cat 6 Bands (Support for LTE:1/2/3/4/5/7/8/12/17/20/28/38/39/40/41)
    attachment.php

    attachment.php

    Stock Apps
    attachment.php

    Treble Supported but A-System partition only
    attachment.php

    Battery Performance Normal Use 7-8 hours
    attachment.php


    Updates
    09/04/2018 I Ordered / pre-ordered
    13/04/2018 New video
    06/05/2018 Received my Chuwi Hi9 Air yesterday Saturday 05/05/18
    10/05/2018 Review posted to youtube see above
    11/05/2018 More pictures and info
    25/05/2018 Link to cases
    04/06/2018 Added links to downloads
    05/06/2018 Added how to flash, how to install magisk and updated known issues
    18/06/2018 Added alternate download link and updated known issues
    20/06/2018 Added TWRP
    01/09/2018 Added links to Build 20180809
    03/11/2018 Added O00623 release-keys 20180905 Update Bugs
    08/11/2018 Download OTA 20181010
    28/11/2018 Download 20181122
    28/11/2018 All CHUWI tablets with Helio X20, X23, X27(or higher verison) will be updated to Android 9.0 in 2019
    14/02/2020 New link to download twrp
    14
    LineageOS 15.1

    This post will be dedicated to all releases. Please read everything carefully before proceeding with the install.

    LineageOS-15.1-1.png


    Downloads:
    v0.1 Fastboot ROM: https://www.androidfilehost.com/?fid=5862345805528051928
    v0.2 Fastboot ROM: https://www.androidfilehost.com/?fid=5862345805528055015
    Magisk for Treble: https://github.com/Jerry981028/Magisk
    Google Apps (choose ARM64 and 8.1, the package variant is up to you): https://opengapps.org/
    The ROM includes my TWRP 3.2.2 by default

    HOW-TO Install:
    1. If you are a Windows User, be sure to have all ADB/Fastboot drivers and tools installed. For Linux, just the tools.
    2. Flash the latest Stock ROM using SP Flash Tool and unlock the bootloader.
    3. Turn on (or reboot, as you prefer) the tablet into fastboot mode (Volume up + Power, a boot menu will appear, choose fastboot mode and confirm with the Volume down button)
    4. Connect it to your PC/Laptop/Whatever (of course)
    5. Run the included script (flash_all.sh for Linux, flash_all.bat for Windows) to start the installation process
    6. Done, the tablet will reboot automatically into LineageOS.
    7. NOTE: If you need Google Apps and/or Magisk, just reboot into recovery mode, wipe data/factory reset, install what you need, and reboot again. No extra steps required in between, just follow the order.

    Current bugs:
    - Animations are not 100% smooth just like the whole UI
    - Default orientation is in portrait mode but the touchscreen and accelerometer will handle it properly
    - Sometimes it glitches during the setup wizard requiring an hard reboot
    - Built-in LineageOS Browser doesn't work
    - Current builds cause a partition size bug (userdata, 4GB only). Please "Format /data" (no wipe) after installation in order to fix it
    - Several issues with Google Apps (Play Services keeps crashing due to library issues). Any variant (like pico, nano...) that doesn't include Webview causes Google Setup Wizard to get into a ~ black screen.

    Changelog:
    v0.2:
    - Massive performance improvements
    - Enabled FM Radio (untested)
    - Disabled animations by default in order to avoid any possible glitch
    - Fixed Open Gapps Stock package installation bug (no space left message)
    - Other minor fixes here and there

    Additions made to improve the device:
    - Certified Fingerprint to pass SafetyNet (as long as you also install Magisk)
    10
    Review

    Unboxing


    1Nmngjjl.jpg


    34A6eijl.jpg



    Following all recent CHUWI products (like the Lapbook Air), this one comes in a eco-friendly packaging with not many accessories included: 1x 5V/2A USB Charger, 1x Micro-USB Cable, 1x Warranty Card and other paperwork.


    w2IXVxGl.jpg



    Something sure is that CHUWI requires a good translator, since the User Manual says something weird in the title: "The User Manual of Poly nuclear series Tablet PC". Okay...:facepalm:


    OCNqcdQl.jpg




    The device features a full metal body with a plastic band on the top where antennas and SIM/MicroSD slots are located. From a design prospective, it looks great on the back, but on the front there is a slight loss of space caused by thick bezels. I am noy saying the bezel-less would be better, on a tablet they are required, but just slightly slimmer would have been nicer.


    H2t3RC0l.jpg



    Its weight is just fine, ~560g, just consider to use it with two hands. Nothing to complain about its thickness, but i would consider to use a case due to the slippery back metal.


    Sp2fq0zl.jpg



    On the front there is the gorgeous 10.1" WQXGA (or wider 2K if you prefer) that looks just excellent except from one thing: the brightness. I read online that its brightness has been limited via software with the latest update. Unfortunately mine was updated out of the box so i can't confirm that, but if that's real, i hope it can be restored via a framework patch to get its full brightness back.

    Anyway, excluding the brightness issue, it looks perfect with great colors (don't trust the photo attached below, reflections destroy it), high pixel density and excellent viewing angles. Also, on the upper center zone, there is a front-facing camera. No sensors (light/proximity) or Notification LEDs are there.


    zHWl41Ql.jpg



    The upper rear side of the device features the Antenna/Slots area together with a camera sensor supported by a Flashlight. It is possible to use 2x Micro-SIMs and 1x MicroSD, with separate slots for each one.


    cQKAdwHl.jpg



    Device

    Camera

    As regards the Camera, it is as good/bad as you can probably expect from a Tablet. Even though the rear camera looks, on paper, quite decent, colors are washed-out. It is probably a 8MP camera sensor interpolated to 13MP, but i was not able to get any detail about the sensor so i may add more details later.

    Here are some samples, judge by yourself. Luckily it supports auto-focus so it is possible to get some interesting macro shots.


    lOcXOpFl.jpg
    vMLixRzl.jpg


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    ebpeibMl.jpg
    nVOwG4kl.jpg



    I won't be posting any front-facing camera sample since the quality is even worse, barely enough for video-calls.


    Audio

    The way speakers have been implemented on this device is quite intelligent and never seen before in person. They are positioned on the top, where the charging port and headphone jack are located.

    Quality-wise they are decent, probably identical to what you can get from a smartphone, just doubled since this is a stereo configuration. Perfectly usable in my opinion.


    502yYku.jpg



    The microphone instead is located on the side, just below the volume buttons. It works decently, but due to the placement it is easy to get one hand on it.


    4zbDiKgl.jpg



    GPS & Location

    GPS quality is excellent for a tablet, able to lock satellites almost everywhere with high accuracy.


    R3sG8seh.png



    Telephony, Mobile Network & WiFi

    The same can't be said for the 4G antenna. For some reason (and this is not an isolated case, just search online to know more), the signal is much lower than what i get on my smartphone, and speed tests definitely confirm that (two different mobile operators tested, same crappy result)


    iRLuqj1h.png
    9XevJiQh.png



    This is a bit disappoting because unlike other Chinese tablets i have found online, this comes with full 4G bands support for my country (and also others) including Band 20, so not being able to use it properly is not that great. Here you can see all the supported bands, i have the European model.


    y91yjTph.png
    aNfJqeZh.png



    Just some extra details about the network cell i was connected too, for geeks.


    ETGOwIsh.png



    Nothing to complain about the WiFi signal reception, pretty average, similar to some smartphones i have reviewed in the past. It is nice to see that it supports WiFi AC networks with speeds up to 433mbps, at least it hasn't been locked via software.


    Y9uMkUWh.png


    Battery Life

    Battery Life is OK, the 8000mAh battery can't do miracles in handling such a beefy Chipset and Screen, and the PCMark Battery Life test confirms it (lowest brightness, WiFi on, Sync on).


    7hrs2Lch.png
    u0CUuaLh.png
    tgsQkk0h.png
    xkYwA2ah.png



    It can be probably improved, but not that much. The Helio X20 chipset is known to be a bit power-hungry.

    Something i am not really okay with is the time required to charge the battery. For some reason, even though the Helio X20 chipset supports it, they have not chosen to not enable it, thus you need to wait over 4 hours for a fully charge.


    Software

    Software-wise i must say that i am impressed with CHUWI's work. This Hi9 Air runs on Android Oreo 8.0 with Project Treble support (but not Google Certified!), but other than that, it is 100% clean, with no bloatware or custom apps unlike most Chinese tablets.

    The beefy screen resolution is noticeable though while scrolling menus or switching between apps. There is a noticeable lack of smoothness, but it doesn't stutter. Some extra GPU power would have solved this.


    C4bNotzh.png
    J2SWZwGh.png


    OfqcERWh.png
    mYbq7Lgh.png


    5wAdwD0h.png
    E3YHQZXh.png


    D2GnfdIh.png



    Benchmarks

    For all benchmark lovers, here you can taste some runs ;)

    Confirming what i have already said before, the GPU power is slightly lacking, but CPU performance can match last-year flagships.


    LrtYlvyh.png
    NegutCQh.png


    rFcMGmph.png


    N8KBGJ6h.png
    xLFg1z8h.png


    xSJ3dkDh.png
    Puw249Rh.png


    p4S0qb3h.png
    lsKcSG8h.png


    UgHxF3Ch.png
    38GDarMh.png


    q7umpLKh.png
    xwUIzVXh.png



    Conclusions

    What to say about this tablet...it is great but doesn't lack its flaws. Build quality is excellent, the design is pretty good, the screen is awesome and the software is clean. With a few tweaks, it should be possible to make this tablet excellent, except for the 4G antenna that, well, is hardware related.

    Do i recommend it? It depends on what you are looking for and, most important, the possible deal you can find online. If you need a tablet that is able to take great photos, avoid it, otherwise, you can consider it. I will be working on it for dev. and try to squeeze the most out of it.

    Pros:

    Impressive screen quality
    Excellent build quality
    Nice design even if a bit outdated
    Clean software with Treble Support
    WiFi AC support and great GPS signal reception

    Cons:

    Lack of GPU performance for such high resolution
    Limited Screen brightness
    Still Micro-USB and no Quick Charging
    Disappointing 4G signal quality
    Barely usable front-facing camera (and the rear one is not that better)


    Rating: 8.3

    Packaging and Accessories: 7.5
    Design and Materials: 9.5
    Performance and Heat Dissipation: 8
    Screen: 9
    Camera: 5
    Sound: 8
    Battery Life: 8.5
    Software: 10
    OEM Support: ?
    Price: 9


    You can find full-res images (I know, Quality isn't excellent) here: https://imgur.com/a/MH6kEeJ

    Official Website: https://en.chuwi.com/product/items/Chuwi-Hi9-Air.html

    You can buy it on many online shops. Official, and authorized, Retailers are listed in the CHUWI website.
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