Always ensure you have legal authorization, backup the original IMEI, and test thoroughly on a development setup before deploying to production. With the right preparation and this guide, you can successfully change the IMEI on most Quectel modules in under 15 minutes.
To ensure the change is persistent and active on the network, restart the device: AT+CFUN=1,1 . Important Considerations
For users uncomfortable with command lines:
Technically, "installing" a new IMEI usually refers to the use of diagnostic tools or AT commands.
| Error | Likely Cause | Solution | |-------|--------------|----------| | ERROR after AT+EGMR | Command disabled in firmware | Use QFirehose instead | | QFirehose: No response from DIAG port | Wrong port or driver not installed | Reinstall Quectel drivers, reboot PC | | Write failed: NV corruption | NV memory locked | Send AT+QNV=... to unlock (advanced) | | Module not entering download mode | Wrong pin timing | Use hardware USB_BOOT method per datasheet | | New IMEI shows as 0 or unknown | Write incomplete | Repeat process, ensure power stable |
: Ensure you have installed the correct Quectel USB Drivers for your operating system (Windows or Linux) to recognize the modem's diagnostic and AT ports.
: Once installed, open Device Manager (Windows) to identify the COM port labeled as the Quectel USB AT Port .