Before writing anything, click and save the .bin file to a safe location. If something goes wrong, you can restore the original (corrupted) state.
Sometimes, entering deep engineering modes ( # #3646633# # ) and resetting the NVRAM accidentally deletes the IMEI. V4.1 is the only low-level fix before resorting to a full re-flash. Spreadtrum Imei Tool V4.1
Modifying an IMEI number is illegal in many jurisdictions unless you are restoring the device's original factory-assigned IMEI for repair purposes. or a specific video tutorial for your phone model? How to use Spreadtrum WriteIMEI tool Before writing anything, click and save the