If the dialer codes do not work or the Engineering Mode is locked, you can use PC-based utilities designed for MediaTek devices:
: If the IMEI is showing as "Invalid," it often indicates a corrupted NVRAM partition. In some cases, you must reload the original stock operating system to fix the underlying partition issue. mt6580 imei repair code
For the MT6580, the primary "repair code" isn't a single fix, but a key to a hidden room called . By opening the dialer and typing: *#*#3646633#*#* If the dialer codes do not work or
A lightweight official MediaTek tool specifically for writing Serial Numbers and IMEIs. mt6580 imei repair code
: There must be a space after "AT+" (e.g., AT +EGMR... ) for some firmware builds to accept the command.