Make a note of this number. You may need to restore it later. Some EC25 modules ship with IMEI write-protection enabled. To disable it temporarily, you may need the "IMEI unlock password" from Quectel (usually available only to verified OEM customers). However, for most standard EC25 modules:
AT+EGMR=1,29,"350123456789012" One of these will work depending on your EC25 firmware revision (check with AT+CGMR ). After writing, you must reset the module for the IMEI to take effect in the radio firmware.
If you need to change IMEIs regularly for legitimate testing, consider using a hardware IMEI switcher board or a software-defined cellular stack like srsLTE, rather than tampering with production-grade modules. | Action | AT Command | |--------|-------------| | Check IMEI | AT+CGSN=1 | | Write new IMEI (standard) | AT+EGMR=1,7,"350123456789012" | | Write IMEI (alternate) | AT+EGMR=1,10,"350123456789012" | | Soft reboot module | AT+CFUN=1,1 | | Unlock IMEI zone | AT+QPRTPARA=1 | | Factory reset (doesn’t clear IMEI) | AT&F | Final word: Always keep a backup of your original IMEI. If you are a genuine developer working with Quectel EC25 modules, reach out to Quectel’s FAE team for the official IMEI rewriting tool—it’s safer and legally compliant. quectel ec25 change imei
OK If not, check power, wiring, and drivers. Always check the existing IMEI before making changes. Use:
AT+EGMR=1,7,"350123456789012" Expected response: Make a note of this number
It is a powerful tool for hardware developers and network testers, but a dangerous weapon for fraudsters. Always adhere to local laws and carrier terms of service.
Then recheck:
AT+CGSN=1 The output should now display your new IMEI. The AT+EGMR command writes to the NV memory, so the change should survive factory resets ( AT&F ) or firmware upgrades. However, if you ever send AT+QPRTPARA=3 followed by AT+QURIPARA=3 , the IMEI will revert to the original masked ROM value.