If you are using a Linux-based system (like Mobian or OpenWrt), you must stop services that might lock the serial port, such as : systemctl stop ModemManager.service Use code with caution. 3. Write the New IMEI
If the IMEI reverts after a power cycle, the module may have a hardware write-protect enabled or a customized firmware that pulls the IMEI from a secondary OTP (One-Time Programmable) memory.
: Once approved, Quectel provides specialized AT commands and proprietary tools to rewrite the IMEI. Technical Context & Common AT Commands quectel ec25 change imei
to verify. The screen spat back the new number. The Quectel EC25 hadn't moved an inch on the workbench, but in the eyes of every cellular tower in the city, the old device had died, and a new one had just been born.
For legitimate business needs, Quectel requires customers to sign a legal agreement. Once signed, Quectel Support (support@quectel.com) provides the necessary proprietary tools and specific AT commands to modify the number for authorized production or repair purposes. If you are using a Linux-based system (like
Engineers often use the AT+EGMR command, which is a standard interface for managing mobile equipment identifiers. For example, the command AT+EGMR=1,7,"[NEW_IMEI]" is frequently cited in technical documentation as the method to write a new identifier to the module's firmware. Legitimate Use Cases
Access to the Quectel AT Port (usually COM port labeled "AT" or /dev/ttyUSB2 in Linux). Step 1: Establish a Serial Connection : Once approved, Quectel provides specialized AT commands
Quectel provides specific AT commands to modify configuration parameters. The process requires unlocking the module's engineering or production mode using an access password. Step 1: Verify Current Module Status
: Newer Quectel firmware versions often block the AT+EGMR command to comply with anti-tampering regulations. If blocked, you may need to downgrade to an older, developer-friendly firmware version using the QFlash tool.
Your current firmware version may have restricted access to the AT+EGMR write parameters. You may need to cross-flash an earlier baseline firmware release or utilize lower-level Qualcomm diagnostic tools (like QPST/QXDM) to alter the NV items directly.
The IMEI is hardcoded into the modem’s firmware during manufacturing. Can You Change the IMEI on a Quectel EC25?