Remove and re-insert the battery (if it is removable). Do not turn the phone on.
Essential for the PC to recognize the device in diagnostic mode. Sc7715 Imei Tool
Download the official standalone executable or the integrated "WriteIMEI" utility package. Remove and re-insert the battery (if it is removable)
Under the Select IMEI Option , check the boxes for (and IMEI 2 if your phone is a dual-SIM device). Sc7715 Imei Tool
Note: IMEI repair is legal only for restoring original, factory-assigned numbers belonging to your specific hardware. Changing an IMEI to impersonate another device is illegal in most jurisdictions. Best SC7715 IMEI Repair Tools