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

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Jan 3, 2023
How can I downgrade, I heard that you cant downgrade android 12. I have T220XXS1
flash via odin, make sure you have selected correct firmware for your phone csc(country code)...
nb: for a7 lite android 11, android 12 , and android 13cvl5, bootloader rev version is still same.. so you can downgrade your phone with lower android version...


Senior Member
Oct 15, 2010
Charging was ok until I removed the splash screen.
All that "mod" does is replace literally two .jpeg images the system shows when booting. If you decompress it, you'll see the charging images intact and since the file only has images, that means the rest of the bootloader is untouched. No idea what really happened in your case.
Successfully flashed pure android 13 GSI hurray!

I've minimized the otatools so it can be preserved easier than full 300mb archive it's now 4mb archive (7zipped)

I may also see if i can rewrite tar-md5-script-tool in bash so this can be used on linux and fully automated, i just don't like the batch scripts

Although i did not test it, this is basically all the batch script does, it's much more readable and concise in shell i don't know why they wrote it in batch..
$ tar --create --format=gnu -b20 --quoting-style=escape --owner=0 --group=0 --totals --mode=644 -f AP_TAR_MD5_CUSTOM.tar *.lz4

$ md5sum -t AP_TAR_MD5_CUSTOM.tar >> ./AP_TAR_MD5_CUSTOM.tar

$ mv AP_TAR_MD5_CUSTOM.tar AP_TAR_MD5_CUSTOM.tar.md5
Last edited:
I just did it manually, it works great


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    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
    i flashed this rom but after the factory reset on the recovery, the tablet freezes on the animated logo cherish os.
    maybe the problem is the base firmware ? i used the T220XXS1BVJ2 base firmware Android 12
    No, your base is not the problem. That particular version of A12 CherishOS uses PHH v415 which has issues booting for our devices. Only PHH v414 or v416 GSIs like this one boot for us (it works for VJ2 firmware, tested it myself). Sadly I don't see any other developer releasing an A12 v416 based GSI like the one I linked to so yes, that's what we have for now until the newer A13 GSIs pick up the v416 patches hopefully.
    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.