Change Imei - Fibocom L850gl

Target Device: Fibocom L850-GL (PCIe M.2 form factor) Common Hosts: Lenovo ThinkPad T/X/L series, Dell Latitude, HP EliteBook Goal: Change the modem’s IMEI using AT commands via a serial interface.

Fibocom modems require entering a special diagnostic mode. Try the following command set: fibocom l850gl change imei

AT+QCFG="imei",1

If that returns OK, you’re ready. If ERROR, try: Target Device: Fibocom L850-GL (PCIe M

AT+EGMR=?

If neither works, proceed with the generic method below. If that returns OK , you’re ready

Using a Linux system with lsusb and modemmanager, you dump the modem’s QMI (Qualcomm MSM Interface – ironically, Intel uses a similar protocol) or MBIM (Mobile Broadband Interface Model) descriptors. The IMEI is buried in the NVM folder.