If a module's NV memory becomes corrupted during a firmware update or due to electrical interference, an engineer may need to restore the original, factory-assigned IMEI to ensure the device remains functional on the network.
: Any modification of the IMEI listed on the warranty card immediately voids the manufacturer's warranty. EFS Corruption
Changing the IMEI of a mobile device is and violates carrier terms of service. It can lead to your device being blacklisted or permanently bricked. This article is for informational and educational purposes only, intended for developers working on device repair. 1. Understanding the Quectel EC25 IMEI Structure
The IMEI is often tied to the specific hardware calibration. Changing it can disrupt factory settings. quectel ec25 change imei
: This often occurs if the modem is actively managed by a service. On Linux systems, stop the ModemManager service before sending commands.
The most direct method is using the AT+EGMR command via a serial terminal (like PuTTY or MobaXterm ).
Quectel modules utilize specific manufacturer-defined AT commands to rewrite the IMEI stored in the non-volatile memory (NVRAM). The command format varies slightly depending on your exact sub-model and firmware revision. If a module's NV memory becomes corrupted during
| Symptom | Likely Fix | |--------|-------------| | ERROR after AT+EGMR=1,7 | Module firmware read-only IMEI. Use Quectel QFireHose or QPST. | | AT+EGMR not recognized | Upgrade firmware to generic Quectel (not carrier-locked). | | IMEI reverts after reboot | You changed only runtime value. Need secure write via AT+QPRTPARA=3 or factory tool. |
AT+CFUN=0 # Disable RF to avoid conflicts
If you are working on a specific implementation,I can provide the needed, clarify the firmware version constraints , or explain how to properly back up your NVRAM to avoid permanent hardware damage. Share public link It can lead to your device being blacklisted
Where 1 indicates write to NVRAM, 7 is the IMEI identifier, and the quoted 15-digit string is the new IMEI.
By far, the simplest and most direct method to change the IMEI on a Quectel EC25 is using a proprietary Quectel AT command: AT+EGMR . This command is not typically found in standard public documentation and is often used for post-production programming or repair at the factory.