If your device is powered by the MT6580 chipset, follow these steps to manually write your original IMEI back to the hardware:
Enter *#*#3646633#*#* into your phone's dialer. mt6580 imei repair code
At the top of the screen, you will see a command line starting with AT+ . For IMEI 1, type: AT +EGMR=1,7,"YOUR_IMEI_NUMBER" For IMEI 2, type: AT +EGMR=1,10,"YOUR_IMEI_NUMBER" Send the Command: Tap "Send At Command." If your device is powered by the MT6580
A lightweight official MediaTek tool specifically for writing Serial Numbers and IMEIs. type: AT +EGMR=1