Most firmware requires entering "Diag" mode first:
Modifying the IMEI on Qualcomm-based modules like the EC25 generally involves using specific AT commands or entering specialized diagnostic modes. Step 1: Establish a Serial Connection Connect your Quectel EC25 board to your PC via USB.
| Aspect | Original IMEI | Changed IMEI | |--------|---------------|---------------| | Registration on LTE | ~3 sec | ~3 sec (no difference) | | Data throughput | 50 Mbps down | 50 Mbps down | | VoLTE (if enabled) | Works | Works only if IMEI range matches device type | | Carrier OTA updates | Works | May fail if IMEI doesn’t match device model in carrier DB |
If you wish to change the IMEI to 354682091234567 , enter the following precise sequence: AT+EGMR=1,7,"354682091234567" Use code with caution. Expected Response If successful, the terminal will return: OK Use code with caution. quectel ec25 change imei
This persistence is critical to understand: any change you make will stay with the module. There is no "factory reset" button to magically revert it, making a full backup of your module's configuration an essential first step.
Changing the IMEI of a Quectel EC25 module involves specific AT commands. However, consider the legal implications and whether such a change aligns with your use case and compliance requirements. Always consult with a legal expert or relevant authorities if you're unsure about the regulations in your area.
Due to the legal and technical barriers, this method is not recommended for most users. It is mentioned here primarily to provide a complete technical picture. Most firmware requires entering "Diag" mode first: Modifying
Cellular providers have advanced tools (DPI - Deep Packet Inspection) that can detect IMEI spoofing, resulting in the modem being permanently banned from the network. Legitimate Use Cases for Modem Configuration
A USB-to-TTL serial adapter connected to the module's UART interface, or a direct USB connection to a host system (Windows or Linux).
If the AT command interface is locked down or returns "Operation Not Allowed," you must access the underlying Qualcomm file system. This mimics the process used on Android smartphones. Expected Response If successful, the terminal will return:
: A USB cable connecting the module to your computer.
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
If the above command fails, try the alternative syntax structure: AT+EGMR=1,5,"123456789012345" Use code with caution. Or simply: AT+CGSN="123456789012345" Use code with caution. Method 3: Using the Quectel +QNV Command (Advanced)
This guide provides a detailed, step-by-step walkthrough on how to interface with the Quectel EC25 and update its IMEI using AT commands. Important Regulatory and Legal Notice