The Fibocom L850-GL is a popular LTE module used in various IoT (Internet of Things) applications, including industrial routers, smart energy meters, and more. Changing the IMEI on such modules might be required for device testing, cloning, or regulatory compliance in certain regions. However, modifying the IMEI without authorization is illegal in many jurisdictions.
Once the modem is in USB/Diagnostic mode, you can use a terminal emulator (like PuTTY or Minicom) to communicate with the modem port (often /dev/ttyACM0 or a COM port in Windows). fibocom l850gl change imei