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Unlock bootloader
https://www.getdroidtips.com/unlock-bootloader-redmi-9-redmi-9a/ -
Downgrade to android 10 (stock rom) by SP Flash Tool or Mi Flash Tool
https://spflashtool.com/
https://xiaomiflashtool.com/
https://xiaomistockrom.com/ -
Download UB rom
Dandelion in name for 9A. Another is 9C (Angelica)
https://gitlab.com/ubports/porting/community-ports/android10/xiaomi-redmi-9c/xiaomi-angelica -
Download Google platform-tools
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Extract ub file and flash
Turn off phone, hold "volume down" + "power" to get into fastboot mode or
adb reboot fastboot
Disable VerifiedBoot
https://www.mediafire.com/file/kvz7dsowp09sfb1/vbmeta_disabled.img/file
fasboot flash vbmeta [path to vbmeta_disabled.img]
fasboot flash vbmeta_system [path to vbmeta_disabled.img]
fasboot flash vbmeta_vendor [path to vbmeta_disabled.img]
Flash dtbo and boot
fastboot flash boot [path to boot.img]
fastboot flash dtbo [path to dtbo.img]
Flash system
# boot to fastbootd mode
fastboot reboot fastboot
# delete product partition to get space for system
fastboot delete-logical-partition product
fastboot flash system [path to system.img]
# Reboot to enjoy Ubuntu Touch
fastboo reboot
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Linux doesn't recognize phone when boot to fastbootd mode ->> try to add udev rules https://wiki.archlinux.org/title/Android_Debug_Bridge#Adding_udev_rules
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Loop boot at redmi logo --> need to flash vbmata. --> use mtkclient if you cannot boot to flashboot https://github.com/bkerler/mtkclient (python mtk w --loader [path to loader]/MTK_AllInOne_DA.bin --preloader [path to preloader]/preloader_k62v1_64_bsp.bin vbmeta [path to vbmeta]/vbmeta.img)
i stuck in here
it can't detected fastboot in fastbootd
in device manager its just show warning
![image](https://private-user-images.githubusercontent.com/31664438/318671686-19429372-e67e-44b2-9c2f-ff2d9b232759.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.gseN3hOgMJn81FrucjLPzweG_x6mgmg-vHJflvE3_PM)