The new IMEI must appear.
Example output:
The primary command to change the IMEI on Quectel modules is AT+EGMR (EFS GSM File Management Read/Write). The IMEI is stored in the NV (non-volatile) memory at location 3, 10, or 29 depending on firmware version. quectel ec25 change imei
One wrong byte can brick the module. QFIL is unforgiving – no “undo”. Requires vendor-specific firehose programmers ( .mbn files), which are not publicly available for EC25 without an NDA with Quectel. The new IMEI must appear
Then check network registration: