Mi 11 ultra 12/512, i tried latest stable and latest weekly. Stuck in fastboot for 2 days, I ended up using EDL services and they flashed global ROM for me.
Im getting same issues as @digeratz . stuck in fastboot loop. i've been following all the advice given to @digeratz . im downloading original chinese version and try to flash that. phone is still unlocked.
edit: when trying flash Chinese version...
this is my 1st time using xiaomi phone. after flashing process finishes, CMD closes but phone still in fastboot mode. Is it suppose to reboot right away? or wait 15min then reboot?