This is tutorial & Review How to update your Xiaomi Redmi 9A/9AT to Android 11 Update using CAOS GSI (Custom AOSP OS) (GSI) from fastbootd mode
Tutorial Howto Unlock Unlock Bootloader Xioami Phone >> Check Here
Files
extract the file using 7zip
Instruction
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fastboot reboot fastboot
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fastboot erase userdata
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fastboot flash system GSI.img
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fastboot --disable-verification --disable-verity flash vbmeta filevbmeta.img
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fastboot reboot
Bang kok disable verity kok unkwon option pas di fastboot
Tested on Redmi 9AT, I have tried 4 with many problems, but this has solved them all! Really great!