thanks man. I lowered the vendor and it worked wellWhich miui version were you on before flashing the rom? Since the rom doesn't ship with custom vendor, it needs stock vendor to work. Flash MIUI 12.0.1 ID Vendor and try flashing the rom again, Or flashing the entire fastboot rom of MIUI 12.0.1 ID.
Global 12.0.3 might work aswell.
Link for 12.0.1 ID Vendor:
Link for 12.0.1 Fastboot rom