Hi,
This is gonna be very short :
As you can see, flashing custom roms/firmwares on (all) Xiaomi devices (after introducing project treble by Google) became a high risky business especially for noobs.
So here is some advice to avoid problems :
1- before flashing any firmware/custom rom : make sure you never choose relock bootloader in MiFlashTools (to avoid hard brick)
2- if you want to relock your bootloader : for example, if your device was shipped with a chinese firmware and you already have unlocked your bootloader, make sure you flash the same regional firmware (chinese one) before relocking it again. Any region mixing = hard brick ! (common error)
3- Mixing firmwares : if your device was shipped with a global/eea firmware and you want to flash a chinese firmware (for a specific rom) or vice versa, use fastboot one but again "don't relock your bootloader" (otherwise = hard brick)
4- tips : before using MiFlashTools, delete .bat files with relock and factory (if you want to keep your bootloader unlocked)
5- never buy a device with unlocked bootloader !
About Anti-Rollback :
Mi 9 Lite / CC9 is not an anti-rollback enabled device, so here you can downgrade from a higher firmware version (10:Q) to the lower one (9
ie) ... However, you can't relock your bootloader even if you use a firmware for the same region !
=> Downgrade = possible / Relocking the bootloader is not allowed for a lower android version +++
Conclusion :
NEVER RELOCK YOUR BOOTLOADER IN ALL CASES !
This is gonna be very short :
As you can see, flashing custom roms/firmwares on (all) Xiaomi devices (after introducing project treble by Google) became a high risky business especially for noobs.
So here is some advice to avoid problems :
1- before flashing any firmware/custom rom : make sure you never choose relock bootloader in MiFlashTools (to avoid hard brick)
2- if you want to relock your bootloader : for example, if your device was shipped with a chinese firmware and you already have unlocked your bootloader, make sure you flash the same regional firmware (chinese one) before relocking it again. Any region mixing = hard brick ! (common error)
3- Mixing firmwares : if your device was shipped with a global/eea firmware and you want to flash a chinese firmware (for a specific rom) or vice versa, use fastboot one but again "don't relock your bootloader" (otherwise = hard brick)
4- tips : before using MiFlashTools, delete .bat files with relock and factory (if you want to keep your bootloader unlocked)
5- never buy a device with unlocked bootloader !
*********
About Anti-Rollback :
Mi 9 Lite / CC9 is not an anti-rollback enabled device, so here you can downgrade from a higher firmware version (10:Q) to the lower one (9
ie) ... However, you can't relock your bootloader even if you use a firmware for the same region !=> Downgrade = possible / Relocking the bootloader is not allowed for a lower android version +++
Conclusion :
NEVER RELOCK YOUR BOOTLOADER IN ALL CASES !
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