In many jurisdictions, changing an IMEI is illegal. Additionally, carriers use various methods beyond the IMEI, such as TTL (Time to Live) tracking, to detect tethering or unauthorized device use. xmm7360/xmm7360-usb-modeswitch: Tools for the ... - GitHub
:To even attempt communication for writing, the modem must be switched from its default PCIe mode to a USB mode that exposes diagnostic ports. This often involves using specialized tools like xmm7360-usb-modeswitch on Linux. fibocom l850gl change imei
Most modern L850-GL modules have write-protection on the IMEI sector. If you receive an "ERROR" response to AT commands, your firmware may be locked. You might need to downgrade to an earlier, "unlocked" engineering firmware before the changes will take effect. In many jurisdictions, changing an IMEI is illegal
: The IMEI is typically hardcoded into the modem's hardware at the factory and is designed to be permanent. - GitHub :To even attempt communication for writing,
: Standard AT commands like AT+EGMR , which work on many MediaTek or Quectel modems, often fail or are restricted on the Intel-based L850-GL. Some users report the command only accepts the original factory IMEI, effectively blocking changes.