If you has TWRP 1227, you must flash the original ROM with MiFlash, and them flash TWRP 1102 or 1217 ( fastboot) nada install 10.2.1.0 ROM againHello! I had troubles with this new ROM. So, now I can't back to the older ROM because my TWRP is DEAD!
My finger print stoped to work! The automatic rotation stoped to, and my aproximity sensor doesn't work!
guys, pls help. what should i do? do i need to install china room and install this rom again or what?i flash my mi4c from miui 8 (that also from here) with this rom. the log show
unmount of /cust failed; no such volume
script succeeded: result was 
Updating partition details. . .
. . .done
when i reboot, i got bootloop. why? and how to fix it?
i forgot to backup. but i can access twrp.