The internet is flooded with fake "E1200M" files that contain viruses or are for different motherboard revisions (e.g., E1200_V1 vs. E1200_V2). Always verify your board version.
: Some official ROMs can help reset or remove forgotten SIM locks. e1200m flash file exclusive
If you lose your IMEI after flashing, use a repair tool to write the original IMEI back to the device. Dead After Flash: The internet is flooded with fake "E1200M" files