Flashing only vendor partition on POCO M3
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Hey!
I have a POCO M3 phone running Ubuntu Touch and I wish to downgrade my vendor partition. Ubuntu Touch pretty much is just the user partition, system partition, and boot partition so I want to downgrade everything else(that will still make my phone bootable) as my POCO M3 has features that do not appear in previous firmware versions that I do not like(eg. When turned off, when charging the phone will turn back on, show a battery indicator, then turn back off, this is in the miui style making it look even worse ;p).
You can use https://github.com/XiaomiFirmwareUpdater/xiaomi-flashable-firmware-creator to generate vendor package from a ROM, then feel free to remove boot.img from the zip and edit the updater-script or put ub boot image there.