So work around is to install TWRP and then use commends
fastboot erase misc
fastboot set_active a
fastboot reboot
credtis: https://miuipolska.pl/forum/topic/63036-hyperos-102434dev/?do=findComment&comment=647895
Hey, i got the same problem, tried two weekly roms and last stable release. Rom instalation is succesful, after that MI logo show for 1 sec and phone goes to Fastboot. Any ideas?
X14 Global, it was unlocked.