How To Guide [GUIDE] [T220/T225] Flash a GSI on the A7 Lite (without TWRP)

Search This thread


Senior Member
Oct 15, 2010
Update Dolby ATMOS magic revision for GSI CherisOS tab a7 lite

v2.6 stable
Thanks for the heads up. I am still using the June build for that excellent module but I couple it with JamesDSP using the Zumreed Sfit Viper-DDC profile. Sounds way better than stock, that's for sure.

Senior Member
Jul 12, 2016
Thanks for the heads up. I am still using the June build for that excellent module but I couple it with JamesDSP using the Zumreed Sfit Viper-DDC profile. Sounds way better than stock, that's for sure.


Senior Member
Apr 12, 2008
Yeah, just saying samsung's roms didn't have it for some stupid reason... otherwise I wouldn't have bothered.... though cherishos is very nice.

Senior Member
Jul 12, 2016

!! CUSTOM AP firmware for install GSI.​

I have founded KG 'Broken' status after Odin fashing with Home_CSC although uninstall Magisk before.​

[ try to update without lost data ]​

May be try to build TWRP for A12.


Jun 27, 2022
can someone compile Pixel Experience 12.1 for Tab A7 Lite Sm-T220 T220XXU1AVE1 with magisk region canada csc T220OXM1AVE1


Senior Member
Oct 15, 2010
can someone compile Pixel Experience 12.1 for Tab A7 Lite Sm-T220 T220XXU1AVE1 with magisk region canada csc T220OXM1AVE1
Android 12 firmware is available for your region. I am no longer building using A11 firmware for A12 GSIs due to some important features like MTP (USB connection) not working when using A11 firmware as the base.

Top Liked Posts

  • There are no posts matching your filters.
  • 1
    enjoy android 12 partitions extracted from super:

    super.ext4.img 6023020544
    product.img 1184133120
    vendor.img 709328896
    odm.img 4349952
    i just tried lineage 20 gsi on a12 fw and it bootloop
    not supported vndklike.
  • 7
    Hi everyone, this is a short guide on how to flash a GSI on the A7 Lite (without TWRP).

    Its a nice little tablet for the price but it doesn't have a very powerful SOC and for me the One UI is barely usable on this device. The launcher and the whole system UI feel extremely laggy, but apps generally run fine.

    I tried phhusson's custom Android 12 GSI and the device was almost resurrected. Much much less UI lag and the battery life is the same as stock ROM. The only thing i found not working is MTP but i don't need it.

    Since i saw a couple users here asking about GSIs i decided to make a very simple guide.

    As always do this at your own risk. You may brick your device. You will void your warranty.

    Follow the guide only if you know what your are doing. Read each step carefully and avoid copy pasting stuff randomly.

    I won't go deep into details as i believe you should have some basic knowledge if you decide to do this.

    The procedure sould work for both T220 and T225 (i tested it on a T220).

    I did this on Windows using WSL for some of the steps.


    Thanks to @kkoo and @Brepro1 for the useful info



    - Unlocked bootloader

    If you haven't done this already follow the steps in parts 1-2 from:

    - Latest official ROM

    I used T220XXU1AVE1 for EUX region

    - Download your preferred GSI

    I used AOSP 12.1 v414 with gapps from phhusson

    - Clean vbmeta.img from Google


    - lz4

    - simg2img

    - lpunpack and lpmake

    - tar-md5-script-tool

    Use the attached


    1. Extract official ROM files (BL, AP, CP, CSC)

    2. Extract AP .tar.md5

    3. Decompress the extracted super.img.lz4

    lz4 -d super.img.lz4 super.img

    4. Convert the sparse super.img

    simg2img super.img super.ext4.img

    5. Unpack super.ext4.img

    lpunpack super.ext4.img

    I got 4 partitions in my image (should be the same for all T220/T225 ROMs):

    - odm.img
    - product.img
    - system.img
    - vendor.img

    6. Replace system.img with your GSI (rename it to system.img)

    7. Get the size of all partitions and the size of the original super.ext4.img (not the sparse super.img)

    stat -c '%n %s' IMG_FILE.img

    8. Repack super.img

    lpmake --metadata-size 65536 \
    --super-name super \
    --metadata-slots 2 \
    --device super:ORIGINAL_SUPER_IMG_SIZE \
    --group main:SUM_OF_ALL_PARTITIONS_SIZES \
    --partition odm:readonly:ODM_PARTITION_SIZE:main \
    --image odm=./odm.img \
    --partition product:readonly:PRODUCT_PARTITION_SIZE:main \
    --image product=./product.img \
    --partition system:readonly:SYSTEM_PARTITION_SIZE:main \
    --image system=./system.img \
    --partition vendor:readonly:VENDOR_PARTITION_SIZE:main \
    --image vendor=./vendor.img \
    --sparse \
    --output ./super_new.img


    Read lpmake docs for a more detailed expalation of the args used above:

    9. Compress the repacked super_new.img

    lz4 -B6 --content-size super_new.img super_new.img.lz4

    10. Compress the clean vmbeta.img

    lz4 -B6 --content-size vbmeta.img vbmeta.img.lz4

    11. Extract

    12. Put all the *.img.lz4 files extracted from AP .tar.gz in tar-md5-script-tool dir

    13. Replace super.img.lz4 and vbmeta.img.lz4 in tar-md5-script-tool dir with your repacked and compressed super_new.img.lz4 (rename it to super.img.lz4) and the clean compressed vbmeta.img.lz4

    14. Run batch.bat in tar-md5-script-tool dir

    You will find the new AP .tar.md5 in the temp-folder subdir

    15. Flash your custom AP .tar.md5 with Odin along with BL, CP, CSC from original ROM

    16. Reboot into recovery and do a factory reset

    17. Done
    Can we boot lineage-19.1 GSI (nogapps, no magisk ) on tab 7 lite ?
    if yes, please compile for test Thank you.
    Device: SM-T225 Regeion: THL
    Happy testing :)

    GSI: lineage-19.1-20220613-UNOFFICIAL-arm64_bvS-vndklite.img
    Thank you so much for compiling the AP for me bro but when i try to flash it with odin i get this error
    <ID:0/004> Firmware update start..
    <ID:0/004> SingleDownload.
    <ID:0/004> preloader.img.lz4
    <ID:0/004> FAIL!

    For your information the current OS build on my tablet is INS with the baseband version of T225XXU1AVB2 and security patch of 1 Feb 2022 hope this helps you.
    Here is GSI build for SM-T225_INS_T225XXU1AVB2
    Successfully flashed GSI with magisk on my T220 following the OP's procedure. MTP is not working as the OP said. However, I can use my flash drive so I don't really miss MTP.

    I chose "system-squeak-arm64-ab-vndklite-gapps-secure.img.xz" for GSI. "Treble Info" app can tell you what image would be compatible with your device.

    If you want to use a different launcher like Nova instead of the default one, change the "Smallest width" setting from 600 to 598 in Developer options to hide the annoying taskbar.

    AOSP-Mods and "Project Themer - Android 12+" work fine for me.

    Here is my build for my device SM-T220 (SM-T220_EUX_T220XXU1AVE1):

    GSI: system-squeak-arm64-ab-vndklite-gapps-secure.img.xz
    Custom AP:
    Custom AP with Magisk patch:

    You can extract BL and Home_CSC from SM-T220_EUX_T220XXU1AVE1.


    Notes: My device is actually SM-T220 XAR, but I have been updating it with SM-T220 EUX firmware versions without any issue.
    Can you share screenshot as I think treble projects are only stable on SD chipset.

    System lang is italian but should be easy to understand.

    I found only a couple bugs so far in phhusson's GSI:
    - in the launcher dragging apps from drawer to homescreen doesn't always work (just use another launcher)
    - crashed once while searching in settings app

    I use the tablet only for media consumption and some retrogaming, so there are probably other bugs i haven't noticed.

    This is a generic guide, it won't include a "known issues" section since it largely depends on what GSI you choose.

    I haven't tested this on the LTE version so i can't say for sure if mobile network works or not.

    Unfortunately i don't have the time to make a custom ROM, test it and keep it updated here on the forum but maybe if there is enough interest someone will do it.

    I hope other users will try to flash a GSI and share their experience here so we can gather some info on working/broken stuff, especially on the LTE model since i can't test that.