Based on the information you provided, it seems like you are encountering issues changing the IMEI on your SIMCOM_SIM8200G modem with the firmware version B03V10_SDX55_LE14_TZ_LGA_V1.25_220915 and hardware version 10A4S-SDX55_SIM8200G_P3.02-0_20220607.
Here are a few things you can try to resolve the AT error you are facing:
1. Check IMEI Format: Ensure that the IMEI code you are trying to input is in the correct format. IMEI codes are typically 15 digits long and should not contain any spaces or special characters.
2. AT Command Format: Make sure you are sending the AT command in the correct format. For changing the IMEI on some modems, the command may be AT+EGMR=1,7,"IMEI_CODE_HERE" instead of AT+SPIMEI=0, "IMEI_CODE_HERE". Check the modem's documentation for the correct AT command syntax.
3. Factory Reset: Try performing a factory reset on your modem to see if it resolves the issue. A factory reset can sometimes clear any underlying issues that may be causing the AT error.
4. Firmware Update: Check if there are any firmware updates available for your modem. Sometimes, updating the firmware can solve compatibility issues and improve functionality.
5. Contact Manufacturer: If none of the above steps work, you may need to reach out to SIMCOM or the modem manufacturer's support for further assistance. They may be able to provide specific guidance or solutions for changing the IMEI on your modem model.
If you continue to face issues after trying these steps, it's recommended to seek professional help or contact the manufacturer's support for more advanced troubleshooting.
PH