[ROM][UNOFFICIAL][9.0][tb8504f/x] LineageOS 16.0 for Lenovo TAB4 8

[highwaystar_ru]

/*
 * I'm not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed (like it did for me...). 
 * Please do some research if you have any concerns about features included in the products you find here before flashing it! 
 * YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you. 
 * Your warranty will be void if you tamper with any part of your device / software.
 * Same statement for XDA.
 */

LineageOS is a free, community built, aftermarket firmware distribution of Android 9 (pie), which is designed to increase performance and reliability over stock Android for your device.

LineageOS is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. LineageOS does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for LineageOS is available in the LineageOS Github repo. And if you would like to contribute to LineageOS, please visit out Gerrit Code Review.

What works:
Calls/SMS/Mobile data
Wifi
Bluetooth
GPS
Camera
Audio
FM radio
WLAN and USB tethering
Broken
You tell me

Source code:
device : https://github.com/lenovo-devs/android_device_lenovo_TB8504, https://github.com/lenovo-devs/android_device_lenovo_tb-common/tree/lineage-16.0-msm8937
kernel: https://github.com/lenovo-devs/android_kernel_lenovo_msm8953/tree/lineage-16.0-tb8504
vendor: https://github.com/lenovo-devs/proprietary_vendor_lenovo/tree/lineage-16.0-msm8937

2020-03-19

• Fixed USB flash mounting when using OTG

mailru: lineage-16.0-20200319-UNOFFICIAL-TB8504.zip
gdrive: lineage-16.0-20200319-UNOFFICIAL-TB8504.zip

Previous versions:

2020-03-13

• Fixed graphical issues
• Fixed USB modem mode
• Selinux now enforcing

mailru: lineage-16.0-20200313-UNOFFICIAL-TB8504.zip
gdrive: lineage-16.0-20200313-UNOFFICIAL-TB8504.zip

2020-03-04

• first release

mailru: lineage-16.0-20200304-UNOFFICIAL-TB8504.zip
gdrive: lineage-16.0-20200304-UNOFFICIAL-TB8504.zip

How to install
You have to had TWRP installed from this thread TWRP and ROOT for Tab 4 8/10 (Plus) (TB-8704X/F/V,TB-X704L/F, TB-8504X/F, TB-X304L/F or one from link below

In TWRP clean Data if you coming from stock ROM and do Install of this ROM. If you have android 8 stock rom installed you have to format Data with data loss, because used encryption is incompatible with android 7.1

TWRP
Built from omnirom android 9.0 source (twrp 3.3.1), includes same kernel as Lineage build, with support for pstore (kernel logs after crash), exfat, ntfs, reboot to EDL mode.
mailru: twrp-3.3.1-1-TB8504.img
gdrive: twrp-3.3.1-1-TB8504.img

XDA:DevDB Information
[ROM][UNOFFICIAL][9.0][tb8504f/x] LineageOS 16.0 for Lenovo TAB4 8, ROM for the Lenovo Thinkpad Tablet

Contributors
highwaystar_ru
Source Code: https://github.com/lenovo-devs/android_kernel_lenovo_msm8953/tree/lineage-16.0-tb8504

ROM OS Version: 9.x Pie
ROM Kernel: Linux 3.10.x
Based On: LineageOs

Version Information
Status: Testing

Created 2020-03-04
Last Updated 2020-03-19

 

[drizzle123]

hero - thank you

 

[jcthrower]

Can this be installed on my 8704v?

 

[highwaystar_ru]

Can this be installed on my 8704v?

No, it is only for 8504, it has different SOC.

Update here

• Fixed graphical issues
• Fixed USB modem mode
• Selinux now enforcing

 

[jcthrower]

No, it is only for 8504, it has different SOC.

Update here

• Fixed graphical issues
• Fixed USB modem mode
• Selinux now enforcing

ok thanks for the response. Are you still planning on updating Lineage 16.1 for the 8704v?

 

[BigBrother84]

Thank you so much for that rom, I'll be trying to flash it next week!

I have question - is there any possibility to get working stock Dolby atmos which is different from that one we can find in other threads

Or

You prefer Viper4android?

Edit: does Netflix work fluently?

 

[Lucinde]

Thanks a lot!

Installation went smooth, so far everything seems to be working.
Still need to set up the tab, but I'm glad I finally got rid of the Lenovo bloatware (like kidoz).
Does anybody know perhaps if it is possible to create restricted profiles in LineageOS? Not by default in this ROM, I'm now trying to figure out if it can be enabled.

 

[highwaystar_ru]

Update:
2020-03-19

• Fixed USB flash drives mounting connected by OTG

 

[Lucinde]

Does anybody know perhaps if it is possible to create restricted profiles in LineageOS? Not by default in this ROM, I'm now trying to figure out if it can be enabled.

If anyone else would have the same question: I found a workaround. You can create a new user via adb with the command "adb shell pm create-user --restricted <username>".
I didn't find a way to create the restricted profile from the settings menu, but once created, it can be managed via the menu.

In the meantime I installed some apps and so far, so good. From the limited time I worked with it, it seems to run smoother than with the stock ROM :good:

 

[BigBrother84]

Previously problem with installing process and bricked now fixed using MI lash and successfully installed lineageos see post 18 and later how to install:
https://forum.xda-developers.com/showpost.php?p=82142685&postcount=18

And 2088, in second twrp thread, for 100% working restoring stock system solution:
https://forum.xda-developers.com/showpost.php?p=82095401&postcount=2088

 

[BigBrother84]

Previously problem with installing process and bricked now fixed using MI lash and successfully installed lineageos see post 18 and later how to install:
https://forum.xda-developers.com/showpost.php?p=82142685&postcount=18

And 2088, in second twrp thread, for 100% working restoring stock system solution:
https://forum.xda-developers.com/showpost.php?p=82095401&postcount=2088

 

[BigBrother84]

Previously problem with installing process and bricked now fixed using MI lash and successfully installed lineageos see post 18 and later how to install:
https://forum.xda-developers.com/showpost.php?p=82142685&postcount=18

And 2088, in second twrp thread, for 100% working restoring stock system solution:
https://forum.xda-developers.com/showpost.php?p=82095401&postcount=2088

 

[BigBrother84]

Thank you @Plant

I have never been trying to restore using fastboot commands, only by twrp.

The problem is that both twrps aren't working good on my device. Every partition formating and updating, it stucks. Once time I decided to wait and after 2 h 13 min nothing happened. I tried to format data using fastboot

 fastboot format data

but error occurred. It said that partition format is " " but twrp said it's ext4 maybe that's why they stuck.

In second twrp 3.2.3 thread, Strephon Alkhalikoi helped me and suggested using MiFlash. It worked and after 4 system updates and personalising I decided not to modify it anymore. The only explanation why it doesn't work may be my first stupid move in twrp - not to modify system - and forced shutdown. Rest should work...

Whole situation It is funny cause I "played" with 5 Sony phones flashing e.g. in two of them, android 9 where stock was 6. Everything was working fluently and fast.
Strange errors surprised me here but I'm really happy that you cared about my situation and try to help :good: thank you!

 

[richardmc85]

Managed to install Lineage on my TB-8504F, but it doesnt get past the Lineage boot animation, no matter how long I leave it.

Pushed TWRP to Recovery, formatted as required. Had to amend the Lineage image to remove the device checks, as although I definately have TB-8504F, it didnt like that TWRP reported it as TB_8504f - ?

Installed and installed GAPPS, cant get past load screen.

I do have a backup, so not concerned, but frustrated!

Any help appreciated

 

[Slack3r]

Thank you @Plant

I have never been trying to restore using fastboot commands, only by twrp.

The problem is that both twrps aren't working good on my device. Every partition formating and updating, it stucks. Once time I decided to wait and after 2 h 13 min nothing happened. I tried to format data using fastboot

 fastboot format data

but error occurred. It said that partition format is " " but twrp said it's ext4 maybe that's why they stuck.

In second twrp 3.2.3 thread, Strephon Alkhalikoi helped me and suggested using MiFlash. It worked and after 4 system updates and personalising I decided not to modify it anymore. The only explanation why it doesn't work may be my first stupid move in twrp - not to modify system - and forced shutdown. Rest should work...

Whole situation It is funny cause I "played" with 5 Sony phones flashing e.g. in two of them, android 9 where stock was 6. Everything was working fluently and fast.
Strange errors surprised me here but I'm really happy that you cared about my situation and try to help :good: thank you!

Sorry it took me so long to see this, but I had similar problems as you initially. It turns out you actually have to install TWRP to the tablet for it to mount /system properly, booting into it from fastboot doesn't work for some reason - that was what fixed it for me at least. It may be different for your device but I had to run the flash recovery command twice for it to stick..

Also want to say thanks to highwaystar_ru, the past few builds have been running great

 

[BigBrother84]

It turns out you actually have to install TWRP to the tablet for it to mount /system properly

Thank you for that important information!

You suggest it may work on my tb-8504f If I install twrp using:

 fastboot flash recovery PATCHTO/twrp.3.x.x.img

After that am I able to boot into twrp using

 fastboot reboot recovery

or buttons combination? Hmh i tried to install TWRP using booted TWRP but stock recovery was booting instead of it. Strange...

Ok so let's imagine theoretically that I did it, but my problems aren't ending on it, I have to modify script installing LOS as @Plant said. (TWRP ERROR 7 - your device is tb_8504f zip is for tb-8504f)

With all that steps you think it may work?

OK, so let's imagine theoretically that it crashed one more time (why not). Am I able to restore everything with twrp installed if I will twrp backup all partitions? Or just reflash everything using MiFlash. Will fastboot flash recovery, modify device recovery permanently? Does MiFlash restores stock recovery? (what is the name of .img that I have to find into system package. Something like recovery.img)? Am I able to unzip just that file, or backup it using some fastboot command and transfer it to my computer?


Thank you for caring!

 

[Slack3r]

Thank you for that important information!

You suggest it may work on my tb-8504f If I install twrp using:

 fastboot flash recovery PATCHTO/twrp.3.x.x.img

After that am I able to boot into twrp using

 fastboot reboot recovery

or buttons combination? Hmh i tried to install TWRP using booted TWRP but stock recovery was booting instead of it. Strange...

Ok so let's imagine theoretically that I did it, but my problems aren't ending on it, I have to modify script installing LOS as @Plant said. (TWRP ERROR 7 - your device is tb_8504f zip is for tb-8504f)

With all that steps you think it may work?

OK, so let's imagine theoretically that it crashed one more time (why not). Am I able to restore everything with twrp installed if I will twrp backup all partitions? Or just reflash everything using MiFlash. Will fastboot flash recovery, modify device recovery permanently? Does MiFlash restores stock recovery? (what is the name of .img that I have to find into system package. Something like recovery.img)? Am I able to unzip just that file, or backup it using some fastboot command and transfer it to my computer?


Thank you for caring!

Yep, you'd need to flash TWRP via that fastboot command and boot to recovery by holding vol up/power. I put the ROM and gapps files on a MicroSD card which was picked up by TWRP.

I had similar problems with the ROM not being compatible after the first failed flash, you should be able to modify the updater-script file located at META-INF\com\google\android to include "tb_8504" as a compatible device. I didn't test this method however, as I reflashed the stock image which combined with installing TWRP on the device solved my issues.

If you need to, the full stock image can be flashed using QFIL and the instructions from here, but I'd recommend trying to restore the backup posted by Plant as the QFIL method can take some time to get figured out. I'm not sure how this compares to MiFlash but that would likely produce the same results.

Hope this helps!

 

[jakub-g]

screen rotation

Does anybody have problem with auto rotation for screen? In mine TB-8504F it doesn't work. Installed some apps which are testing sensors and none sensor responsible for screen rotation is vsible after flashing this system.

---------- Post added at 04:43 AM ---------- Previous post was at 04:24 AM ----------

If you will brick your device as me you can always use Qualcomm Flash Image Loader (QFIL) with proper files for your device. Note for mine works QFIL v2.0.0.1. Newer versions won't work with my device. It will load stock android 7 then under TWRP you can wipe and flash Lineageos. Firstly was bricked while was going from And 8.0 and not flashed but only booted TWRP. As mentioned above need to flash TWRP

 

[matthvh]

I tried restoring the backup, but after I tried booting into system I got a black screen I can't fix. Power buttons don't work, I can't boot into recovery / anything else. No logos or text. It's like the battery is dead, but I can't power it on. Tried charging it, because the battery was around 10% when I tried restoring the backup, but I don't think that will help. Any other ideas? I think I lost this device for good.

 

[Wrighton]

Hi,
After coming from stock 8.0, I’ve got everything up and running which appears to run great.
However, I am struggling to get my PS4 controller working.
It will connect fine via Bluetooth, but no input is detected.
Any ideas?