Over-the-Air Firmware Updates for Constrained NB-IoT Devices

Use an external, dedicated power supply for the evaluation board rather than relying solely on host USB bus power. 3. The Network Rejects the Module After Installation

# Set the new IMEI ser.write(f'AT+QIMEI="imei"\r'.encode()) response = ser.readline().decode().strip() if response != 'OK': print(f'Error: Failed to set IMEI to imei') return

Certain firmware iterations or engineering samples allow specific write commands.

Technically, "installing" a new IMEI usually refers to the use of diagnostic tools or AT commands.

To change the IMEI, use the AT+EGMR command with the write parameter. Command: AT+EGMR=1,7," " Example: AT+EGMR=1,7,"351234567890123" Response: If successful, the module will return OK . 4. Restart and Verify To make the change active, restart the module. Restart: AT+CFUN=1,1

To change the IMEI on a Quectel module, you primarily use AT commands

Select the corresponding to the Quectel USB AT Port . Set the speed to 115200 baud (default). Type AT and press Enter. The module should respond with OK . 2. Query Current IMEI