How To Guide Install GSI ROM - Xiaoxin Pad Pro 2021 [TB-J716F]

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Winterpeen

New member
Jun 13, 2022
3
0
Hi guys,

I think i bricked my tablet but I'll try to get it fixed with help from, I hope, some of you. I went into recovery mode and changed the boot option from slot A to slot B. The tablet rebooted and then went down to never come alive since then. When I connect it to my pc it will recognize that something has been connected but that's it. (Tried it on W10/W11 and different pc's)

Any idea how to get it back to life?

Using anyting from adb fastboot/reboot or anything it will say that the tablet has not been found and it is waiting for one to connect.

I hope somebody has any tips or tricks.

Thanks in advance.
 
Apr 23, 2020
27
14
Hi guys,

I think i bricked my tablet but I'll try to get it fixed with help from, I hope, some of you. I went into recovery mode and changed the boot option from slot A to slot B. The tablet rebooted and then went down to never come alive since then. When I connect it to my pc it will recognize that something has been connected but that's it. (Tried it on W10/W11 and different pc's)

Any idea how to get it back to life?

Using anyting from adb fastboot/reboot or anything it will say that the tablet has not been found and it is waiting for one to connect.

I hope somebody has any tips or tricks.

Thanks in advance.
Hi!

Booting into Slot B forced you to boot into EDL mode, and you have no choice but to install the Stock ROM to fix everything.

Of course, there's a thread in this forum for that, just follow the instructions carefully.
 

mikeinside

New member
Jul 10, 2022
3
0
Hello.I couldn't install a custom firmware, I got a bootloop..can someone tell me what I'm doing wrong?
I did it according to the instructions :https://forum .xda-deve…2021-tb-j716f.4348249/
You need to know which firmware to install custom, the installation procedure. I did everything according to the instructions from xda, downloaded this firmware crDroid-8.6-a64_bgN-vndklite.img. Then I switched the planch to fastboot mode, installed vb net.img with xda, then switched the planch to fastboot mode and tried to install crDroid
the invalid sparse file format at header magic error came out, but the packages went like with c kb,then according to the instructions I chose a date reset, erased everything and tried to boot, as a result, bootloop infinite loading, the loader unlocks, then the Lenovo screensaver and this is constantly repeated....rolled back to the stock rom.The bootloader is unlocked.What I'm doing wrong is not clear.Maybe it was necessary to try in EDL mode, but how? can someone tell me
 

hooutoo

Senior Member
Apr 17, 2009
490
78
Ft. Lauderdale
I just installed a13 gsi beta 4.1 to my rooted TB-J616F. It installs and is up and running but have one little problem. LOL

It seems the permissions are totally screw up. I can't run Google Play updates nor can I install an app. Just keeps returning an error that there's no available space. Is there a way thru fastboot or adb to reset all file permissions.

Or any possbile ideas to fix this would be greatly welcome/appreciated.
 

hooutoo

Senior Member
Apr 17, 2009
490
78
Ft. Lauderdale
Btw, right now I have a12L gsi: gsi_gms_arm64-exp-SQ3A.220705.003.A1-8672226-7230b502.zip up and running. There's no problem with screen rotation and am using Apex Laucher Pro with screen orientation set to landscape. I'm able to hide the Nav bar by depressing the bar and holding. It then is reduced down to just a thin line.

The problem here is I'm unable to get play videos in either Chrome or Youtube app.

Again, any ideas on fixing this video problem would also be greatly appreciated. Btw, I already tried clearing cache/data, uninstall/reinstall, pretty much all the usual supects. Nothing so far.
 

Winterpeen

New member
Jun 13, 2022
3
0
Hi!

Booting into Slot B forced you to boot into EDL mode, and you have no choice but to install the Stock ROM to fix everything.

Of course, there's a thread in this forum for that, just follow the instructions carefully.
Hey,

So I had it working, everything was working fine, went on a holiday and the pad probably ran out of battery.

Came back from holiday and started to charge the pad but nothing happend. I also plugged it in the computer but this time not even a single sound from plugging it in my computer came up.

I cannot get the pad to boot or give a single sign of life out of it. Do you have some experience with this? I haven't done anything between the time it was working and the battery running out.

I charged it for over 24 hours but still nothing. I hope somebody has some experience (wihthout returning it to the dealer) with dead tablets...

Thanks in advance
 

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    How to install GSI ROM - Xiaoxin Pad Pro 2021 [TB-J716F]

    I tried to install a GSI ROM on this tablet, because there is only a chinese version available.
    The tablet supports treble and I managed to get different GSI ROMs booting on it, but with a few annoying bugs I couldn't solve.
    I thought I will share my experience here and maybe someone with more expierence can help to solve these problems.
    Your data will be deleted, try at your own risk.

    Treble Device Information (Treble Info):
    Required Image: system-arm64-ab.img.xz
    Supports modern version of treble and uses VNDK30.0
    Supports System-as-Root, uses A/B operating system
    Supports seamless upgrades and uses dynamic partitions (super partition)
    Requirements:
    Installation:
    1. Go to "Settings" ->"System" -> "About Phone", tab on it until developer settings are enabled.
    2. Go to "Developer Settings" and enable "USB Debugging", allow USB-Debugging if tablets asks.
    3. Reboot to bootloader: "adb reboot bootloader"
    4. Flash vbmeta.img: "fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img", you only need to flash it once
    5. Reboot to fastbootd: "fastboot reboot fastboot"
    6. Flash GSI-ROM: "fastboot flash system lir-v313+211012-arm64-bgZ-lite.img" and wait
    7. Using volume keys on tablet select "Enter recovery" and then select "Wipe data/factory reset", reboot device.
    8. Now it tries booting the ROM, after the "bootloader unlocked" warning, the lenovo logo should show up. Here I often had the problem that it didn't boot at first try. If, after waiting for 20-30s the ROM doesn't boot, press the power button to reboot tablet. After trying it a few times it always worked. This problem only occurs at first boot up, after setting the ROM up, it boots normally.
    9. Now after booting, when using the LiR-ROM, you have to set up the tablet. In the fourth setup window, the ROM is asking for a SIM-Card even though the tablet doesn't support GSM. You can skip this by entering to adb commands "adb shell settings put secure user_setup_complete 1" and "adb shell settings put global device_provisioned 1". After sending these two commands, then pressing return in the setup, it should complete.
    10. After successfully booting, the "Home" and "Tasks" button is missing. After a reboot they should appear and work normally but I recommend to set a lock pin first.
    Known Bugs/Problems:
    AutoRotate
    When activating autorotate, the display is always orientated in the wrong direction by 270°.​
    I tried to solve it with two different commands added to build.prop:​
    1. "ro.sf.hwrotation=270" -> didn't do anything​
    2. "ro.surface_flinger.primary_display_orientation=ORIENTATION_270" -> the screen rotated in right direction, but the touchpanel did not.​
    Workaround: using an rotation controll app, but I'm not a fan of it.​

    Overlay - AutoBrighness, Magnetic Screen Lock, Battery Save Mode
    I tried creating an overlay according to the instructions but sadly the "FrameworksResTarget.apk" from the vendor folder doesn't provide much configuration information including for the above mentioned issues. I tested values from similiar devices but didn't have any success. If someone is interested to try, here are the files I extracted from the tablet and the current overlay I created.​

    Hopefully, someone here knows how to solve these problems.
    4
    We should spam this forum thread, maybe then they will eventually react :D
    4
    After a lot of jumping through hoops, I was able to get custom ROMs running on the tablet. Though I do want to share my experience with it.

    I chose to run BlissOS 15.3 on it the first time, and it worked quite well, despite the known bugs such as the rotation, adaptive brightness not working, and the phhTreble settings not working either. (Not sure if it is specific to the ROM but there's that.)

    A few things I noticed, TWRP would encrypt the partitions if you enabled a password on the system, and the decryption password is not the same as the one you set as the system password.

    Another thing is setting the screen cutout to anything else other than the default, to which it will cause the whole screen to turn to black, rendering it useless unless you wipe the data in recovery mode.

    I also found out that by changing the boot animation, it doesn't actually write on it, turning the bootanimation.zip file to 0 bytes when moved, a.k.a. it becomes non-existent, and thus when rebooting the tablet, it will drastically slow your device down. Sometimes it even heats up the device, I can even feel it through the casing.

    I also tried other Android 12 GSIs, including Android 12L ones, but it had a few more issues, especially the navigation bar on Android 12L.

    So for me, BlissOS works fine the best for me.

    If anyone can find out how to fix these kinds of issues, let us know.

    Thanks to @Tropaion for the instruction guide!
    3
    @gunalarix8 Sadly not possible because there is no kernel source.
    @TheNiceGuy11999 I created a GitHub issue before.
    I you read through the first thread page you can finde everything you wanted.
    Lenovo uploaded the open source file for global variants. I could not find the chinese variants. 🤣 It was uploaded very recently. 😁