ROM / Firmware/ Brick Recovery for 7" Android Head Unit AC8227l YT9217 YT9218 1/16GB

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lagakappa96

Member
Jun 12, 2013
15
2
Poland
@lagakappa96 i have the same unit yt9216b 2/32 and at this moment im looking for the same. Unfortunately im now with firmware for 9250 and my touch screen and sensor keys dont work. Only with plugged mouse i can use the device. Tomorrow i will try with one of these and with the original preloader file from site : http://file.xygala.com/?dir=uploads/XY公版/9216/9216B/Android9.1/中文/横屏/1024x600/UI1_v6.5

To log there you can use username xyauto and password 123456

Im attaching screenshots with what i gave atm.
Thanks for your response! I am a little relieved that i'm not the only one with such problem.
I have (I think) all of the firmwares for any 1024x600 devices. Even tried to flash couple of the with different resolution - it didn't work at all (as expected)
However - I can't open the scatter file from the fw you gave me.I'm using SP Flash Tool 5.1924. I also tried to open it in versions 3.1328 and 1344, aswell as in ATC Flash Tool 2017.07.14
Did you use other scatter file and map files manually, or did you use other method?

EDIT: I flashed it successfully, don't know why flash tool won't opened file, after restarting pc it flashed. But it's still the same thing - splash and then blackscreen.
 
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Scuderia_Alfa

New member
Feb 20, 2021
1
0
hello everyone :)

Im new in here and i've bought a Yt9213a MCU1 unit with UI2 lancher on it...

I will love to try UI4 since i heard that we can play around with widgets, anyone have that UI available to download?

In APK format please...
I have a launcherUI4.apk that i downloaded from other topic but it didnt work! The headunit trows an error of instalation.
 

Proff55

Member
Feb 21, 2021
10
2
Padova
Hello everybody (y)

I just joined the forum, but I have been following you a lot.
I am using an AC8227L HU with FW YT9216C_AHD_00005_V004_20190807_HIFI
With your help and that of the Russian site 4PDA, I installed TWRP and ROOT the system.
Added FMRadio with RDS also with name of the radios on the buttons.
I have a problem with TWRP vers. 3.0.2.0, which seems to be the only one working on these radios.
I can't make a backup even of the system partition.
After less than a minute, the video freezes and the system restarts.
Backing up small partitions like boot - lk - recovery etc does it without any problems.
Has anyone happened the same thing?
Thank you all for the work you are doing.
 

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Proff55

Member
Feb 21, 2021
10
2
Padova
Hello everyone,
I tried to unlock the bootloader with fastboot commands, but the confirmation system allows me to press the volume key +.
Unfortunately my HU does not have the volume buttons but only the wheel.
Attached is the photo of the motherboard, the highlighted points refer to the unlocking of the system in case of total lockout.
Can anyone tell me which is the volume + point to put mass?
Thank you
 

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rosrus57

Member
Sep 11, 2015
9
3
For anyone interested in the "Engineering test debugging" password after logging in, through the four eights...
It's no longer a secret - here she is:
26959910

From the menu there you could change the option for the stereo the system so that when the car is turned off, it not only stays stopped, but also turns off completely.
 

rosrus57

Member
Sep 11, 2015
9
3
Sir Proff55 - These are exactly the points you mentioned ...
And here's how I took them out on the back cover ...
One (upper) volume increases and the other button decreases it ...
And do not give any of the conclusions "on the table" - both, as well as the others are not given to the table, but to the second with a larger diameter - in my case I soldered the white cable to this common point, namely the second point with the larger diameter ...
 

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Proff55

Member
Feb 21, 2021
10
2
Padova
Hello everyone,
I have a problem with TWRP vers. 3.0.2.0, which appears to be the only one to work on these radios.
I can't even backup the system partition.
After less than a minute, the video freezes and the system restarts.
Backing up small partitions like boot - lk - recovery etc. It does it without problems.
Screen timeout is disabled.
Did the same thing happen to anyone?
Is there a remedy?
Thank you all for the work you are doing.
 

rosrus57

Member
Sep 11, 2015
9
3
Thank you,
so if I understand,
white / yellow = volume -
white / green = volume +
Thank you,
so if I understand,
white / yellow = volume -
white / green = volume +
No, it's the other way around - white and green are for reducing the volume, and white and yellow are for amplifying the sound. In fact, the connection between the two big points is to amplify the sound. Only it is needed to recover a broken device.
In fact, the wires are very thin, but enlarged in the picture they look thick...
The cables are relatively easy to solder at large points, but you have to be very careful about the small point - you have to have good eyesight and a soldering iron with a very sharp tip.
 

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Proff55

Member
Feb 21, 2021
10
2
Padova
Thank you,
I had already found the post where it was described the unlocking of the bootloader with the photo you attached.
[Tutorial] AC8227L head units - how to unlock the bootloader
I had already tried but with negative result, the system wrote unlock failed.
In the post was also put this: In the image I attached, you're looking for the points marked 1 and 2. The caption on the image suggests they connect to Volume Up, but on every unit I've seen these points connect to Volume Down. Your mileage may vary. The layout of these points can vary from model to model, but they're always in this area.
Points 1 and 2 I used them for a hard reset after a total lockdown. (Big brick), fortunately fixed by restarting Flash Tool.
However, it does not matter, now I have no intention of taking the radio apart and trying.
Even with the bootloader locked, I rooted, installed TWRP, updated ROM, installed FMRadio with RDS, fixed the Mac Address that changed with each reboot etc.
Before doing anything, I had done a complete system dump including the userdata partition.

Thanks again for your concern.
 

Matchless 2015

Senior Member
Nov 13, 2015
100
47
Thank you,
I had already found the post where it was described the unlocking of the bootloader with the photo you attached.
[Tutorial] AC8227L head units - how to unlock the bootloader
I had already tried but with negative result, the system wrote unlock failed.
In the post was also put this: In the image I attached, you're looking for the points marked 1 and 2. The caption on the image suggests they connect to Volume Up, but on every unit I've seen these points connect to Volume Down. Your mileage may vary. The layout of these points can vary from model to model, but they're always in this area.
Points 1 and 2 I used them for a hard reset after a total lockdown. (Big brick), fortunately fixed by restarting Flash Tool.
However, it does not matter, now I have no intention of taking the radio apart and trying.
Even with the bootloader locked, I rooted, installed TWRP, updated ROM, installed FMRadio with RDS, fixed the Mac Address that changed with each reboot etc.
Before doing anything, I had done a complete system dump including the userdata partition.

Thanks again for your concern.

I have the same HU as yours with 2/32 memory and also want to update, but could not download TWRP for the 2/32 HU. Is there any possibility getting a copy of yours?
Thanks
 

Proff55

Member
Feb 21, 2021
10
2
Padova
I got the recovery partition from a ROM downloaded from the 4PDA site: https://drive.google.com/file/d/1dN6THOa6UfqepPvso1QN4_-kr66w_HHN/view
With Flash Tool, your scatter, flash file of the recovery partition only.
I have tried various recoveries and this one works.
Warning, it is not possible to make a full backup or backup of large partitions, as HU freezes, the monitor wobbles and then resets.
Small partitions all OK.
Zip file installation OK.
I have read somewhere that this problem is known and affects 1/16 and 2/32 systems.
For a complete backup of the ROM I used Flash Tool's Readback and with WwR_MTK I unpacked the ROM by obtaining the various partitions.
Before doing any operation on the ROM, always make a full backup.
This saved me in many HU brick situations.
Hi and good luck.
 

motinka

Member
Jan 23, 2021
25
1
I flashed the radio, picked it up well, as you can see it in the picture. Then I assembled it, and after turning it on, it's the same as it used to be.
Black screen, side touch buttons illuminate.
What could be the problem?
error03.jpg
 

Matchless 2015

Senior Member
Nov 13, 2015
100
47
I got the recovery partition from a ROM downloaded from the 4PDA site: https://drive.google.com/file/d/1dN6THOa6UfqepPvso1QN4_-kr66w_HHN/view
With Flash Tool, your scatter, flash file of the recovery partition only.
I have tried various recoveries and this one works.
Warning, it is not possible to make a full backup or backup of large partitions, as HU freezes, the monitor wobbles and then resets.
Small partitions all OK.
Zip file installation OK.
I have read somewhere that this problem is known and affects 1/16 and 2/32 systems.
For a complete backup of the ROM I used Flash Tool's Readback and with WwR_MTK I unpacked the ROM by obtaining the various partitions.
Before doing any operation on the ROM, always make a full backup.
This saved me in many HU brick situations.
Hi and good luck.

Thanks much appreciated!
 

lolloxda

Senior Member
May 13, 2009
113
11
Roma
Hello,

Unfortunately after Flashing a wrong firmware I made a Hard Brick.

Now connecting the USB cable is not detected by the PC.

I tried with the Test Point with current connected and also without, unfortunately
the PC does not recognize anything.
I also tried with the GND cable to do the Test Point but nothing ...

I have tried in every way, but nothing does not give signs of life the usb ....

Can anyone help me?

My model is originally a 1/16 YT9216B.

Thank you.
 

lolloxda

Senior Member
May 13, 2009
113
11
Roma
@lolloxda ,try to use 4 pin USB and again try with the wire method with two test points. When i was in your situation my 6 pin USB did not the job. Im giving you link for rom im using atm on 2/32 i hope it will help you.
I use the USB cable out from radio, i ever use it to flash...
 

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  • 1
    I updated my HeadUnit yesterday. On the previous version, one from 2018 I had a dash cam recorder, chinese one, I think, that worked with my usb camera conected into a hub. After update and factory restet the app is not there anymore. Anyone knows the name of the app and where can I find it? Thanks
    I have an app that was included with my camera. I can upload it for you if you want
  • 33
    ROM / Firmware/ Brick Recovery for 7" Android Head Unit AC8227l YT9217 YT9218 1/16GB

    Thanks everyone who contributed in my effort to fix my bricked device. Here is all that I have found useful in successfully reviving my device.
    The files shared here are the ones that worked on my unit (see specs and pictures below) If your device is different, it may or may not work.
    If the device has dedicated radio chip inside, the Firmware number will show as YT9218, if no radio chip, then it will show as YT9217
    Note: if your device is not bricked, Make a full backup before trying another firmware.

    I hope it helps. (donations are always welcome ):highfive:

    Memory dump:
    firmware 20181222 HiFi: (Link) (thanks mazepa2000) (May 2019 update below)
    Rooted TWRP firmware 20190523 HiFi: (Link)

    Preloader (Boot_1) from other Similar Firmwares: (Link)
    Download the one similar to your device's version.

    Firmware via flash tool: Rooted TWRP 20190523 (Link) Thanks Maxkir
    (You may need to remap side touch buttons in Factory settings (code 8888) -> Touch settings -> Click start -> Name of the button -> The button itself ->Repeat for all the buttons -> close -> ok).

    Firmware for YT9213 Device: (Link) (Thanks pajurpl)

    Update / Upgrade Files USB flash drive:
    Firmware 20190522 HiFi: (Link) (Thanks foxgiggle , iSevenAuto)
    Firmware 20190906: (Link)

    MCU 3.1 (Link)(Thanks foxgiggle )
    MCU 2.8 (Link) (Thanks lemmon and foxgiggle)

    Memory Dump Procedure via flashtool:
    (Memory dump is only needed if you need full recovery from a backup. Otherwise you may only need to do the next part.)
    Download and install MTK drivers. (Link)
    Load scatter file and preloader (Link) in spflashtool. Press Ctrl Alt V , then go to Window and select "write memory". In file path select "user", in begin address put 0x0, In Region select the partition named "EMMC_USER". Hit Write memory. After that plug in the usb cable (connected to usb1 port). If the device is not detected, you need to power it on. If still not detected then you might need to short the two test points (see picture) (without power this time) and then plug in the usb cable. Remove the short when write process starts. Check if the issue is fixed. If its not fixed, then do the same to write boot2 and boot1 partitions as well. You may need to download Boot_1 specific to your original firmware from the link above.

    Uploading Firmware (full or parts) via flashtool:
    If you are uploading the firmware available in parts, you only need to upload "BOOTIMG" and "ANDROID" (SYSTEM).
    You may also need to flash "RECOVERY". Remember to uncheck the preloader. Here is a nice instructions file. (Link) (thanks Maxkir)
    There is more info and firmwares to chose from at 4pda forum.

    Update / Upgrade Procedure via USB flash drive:
    Copy the zip file (do not extract) to usb drive or microSD card, (formatted by SD Card Formatter). Connect to usb port 1 or 2. Go to Car Settings, System info. Click Android Upgrade.
    --OR--
    Extract the zip into a folder named XYAUTOUPG into the flash drive or microSD card, connect to usb port 1 or 2 and then reboot. Upgrade should start automatically. You might need to try with different USB drives or sd cards. For some reason this only works with certain usb and cards.

    MCU Upgrade Procedure via USB flash drive:
    Extract the mcu file into flash drive or microSD card. Connect to usb port 1 or 2. Go into system info and update mcu.

    Make a Full Backup/Memory Dump:
    Open SPFlashtool, Select Memory Test Tab, Select only RAM Test (uncheck the rest), push start, and connect the unit. Save the information appeared, in a text file for later. (Read above "Memory dump procedure" for the usb connection setup).
    Now go to ReadBack Tab, Double click on empty space next to tick mark, Select a folder where you want to store the dump file, and Type a name for the dump file you are going to creat, (ie. Boot_1, Boot_2, USER). Click Save. In next window "Readback block start address", select the region you want to make backup of (ie. EMMC_BOOT_1, EMMC_BOOT_2, EMMC_USER).
    Start address is 0x0000000000000000
    Length copy and paste from the text file you created earlier.
    typically for Boot_1 and 2 the length is 0x0000000000400000
    and for USER (16GB models) the length is 0x00000003a8000000
    Click OK.
    Now click on Readback and then connect the unit via usb cable. and Read process will start.
    Do the same to make backup of all three partions. USER will take long time because its the largest partition.

    RDS FM Radio:
    Radio app with fixed RDS, channel names on buttons and HiFi: (Link) (thanks sjguk)
    Copy to FMRadio directory, rename to FMRadio.apk and change permission 764. (or 755 ?).

    Channel name Editor: (Link) (thanks mclaught)
    install as normal. You may need to install GalaPublicResources. Click top right dots.


    Multi Window Mode:
    Go to root folder, look for build.prop. Open in text editor. Change the line ro.build.type=user to ro.build.type=userdebug.
    If no such line is there, then simply add the line at the end. Save and exit. Go to Android settings, Developer options, look for multi window mode and enable it. Swipe down from the top of the window, Click on recent apps tile. You'll see the new multi window option there.

    Subwoofer output Pin:
    The default AUX_out pins are for mid range audio and is controlled by Mid slider in the mixer. The subwoofer output is on another pin (See Picture).
    it is easy to remove one of the AUX_out pin and install it at the Sub output. this pin is controlled by Subw slider in the audio mixer.


    Launchers UI1, UI2, UI4 (Link), UI5 (Link) (Thanks Maxkir)

    Boot animation: (Resolution is 1024x600)
    eg. (Link)
    The animation preview didn't work for me, but I installed it anyway and it worked fine.

    OBD Dongle Bluetooth Setting:
    Open Bluetooth app, Click on settings, tap on the pin code "0000" and type in "1234" instead. Save settings.
    Now search and connect the OBD dongle normally.

    I hope it helps. (donations are always welcome ):highfive:

    Unit Specs:
    motherboard marking YT9217 VER1.5 XY AUTO also 9218 VER2.4 XY AUTO near the antenna
    Model no 8227L_demo android 8.1
    Android YT9217C_00005_V003_20191402_HIFI
    Kernel 3.18.22
    DDR 1GB FLASH 16GB
    CPU A7 1.3GHzx4
    Amplifier AC7315 mos bile duct 45Wx4
    AutoChip ARM AC8227L
    Mediatek MT6323LGA
    Kingston EMMC 16G
    4
    the link takes me to the main page. and then its like finding needle in a haystack.

    All relevant info about ROMs and flashing you can find in top header of this russian forum.
    Look at the spoilers in the gray header layer and use Google translate to understand what is written there.

    There are 3 ROM versions for the 8227L based head units. I downloaded and installed the oldest of the 3 (rooted and TWRP IMG included). Copy all files from the RAR to a flashdrive in root folder.
    Turn off the head unit.
    Connect the flashdrive to USB 1 slot of the head unit.
    Turn on the the head unit.
    The install process starts immediately after turning on.
    It takes about 10 minutes.
    When install process is ready, turn off the head unit.
    Detach the flashdrive.
    Turn on the head unit and it will boot with factory settings like a new device....

    Note that there are also ROMs for flashing wit MTC flash tool downloadable.
    But the versions for installing from USB sticks ( po russki - dla flashky) are more comfortable to install and I don't own a Windows pc. So this variant was my favorite method...

    Regards and good luck...

    Edit: if your unRAR program asks for a password for unpacking the RAR file, then use Eazy unRAR app from Playstore on your Android device - it ignores password lock in RAR file ;) ...

    Edit2: the 5th gray spoiler in the top header of the Russian forum hosts the links to the ROM RAR files...
    4
    new firmware and MCU

    comming soon:
    16808269.png
    3
    Lots of info on those headunits (russian, use google translate):
    http://4pda.ru/forum/index.php?showtopic=936535

    pinout:
    3
    Very nice indeed.
    Im using Agama launcher at the moment, far better than others in my opinion.
    a bit off topic...

    Updated to MCU 2.8 - automatic acc off time delay works > 24hours...
    I modded the UI2 Launcher a little bit for my personal needs.
    See attached screenshot.
    (my car, VW golf plus 2013, is now shown in Homescreen...)
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