E1200m Flash File Install Guide

No. Flashing stock firmware locks the bootloader by default. If you need root access, you will have to unlock it separately after the flash.

: If the phone keeps restarting, remove the battery, perform a hard factory reset via the recovery menu key combination, or re-flash using a different version of the stock ROM. e1200m flash file install

No. A full, proper flash file install requires a PC and SP Flash Tool. "Local updates" from an SD card only update the recovery partition, not a full firmware. remove the battery