How to Change the IMEI on a Fibocom L850-GL LTE Module: A Technical Guide
There are several methods to change the IMEI of a Fibocom L850GL module:
The change is only temporary until a power cycle. Send: fibocom l850gl change imei
What (Windows 10/11, Linux) are you using to manage the module?
is a highly popular LTE Cat-9 M.2 wireless module built on the . Widely deployed in enterprise laptops like the Lenovo ThinkPad series, it provides high-speed cellular connectivity. How to Change the IMEI on a Fibocom
Replace COMX with the actual COM port number you identified earlier (e.g., COM3 ). Replace YOUR_NEW_15DIGIT_IMEI with the IMEI number you want to write. For example: sec_provision.exe -c COM3 -i1 356938035643809 -k Sprk2048dev.key
This will return the 15-digit string currently flashed to the device's volatile or non-volatile storage. The Challenge of the Write Lock Widely deployed in enterprise laptops like the Lenovo
Need help? Leave a comment below with your exact laptop model and modem firmware version (get with ATI ).
Below is a comprehensive guide to understanding the Fibocom L850-GL module, the mechanics of AT commands, and the technical realities of IMEI modification. Understanding the Fibocom L850-GL Hardware
Improperly writing the NV RAM can permanently damage the modem firmware, making the module inoperable.
Modern firmware versions of the L850-GL feature locked bootloaders. If the system detects that the NVM or calibration data has been altered without a valid cryptographic signature, the module will enter a hard-brick state (often loops in "Flash Loader" mode) and refuse to register on any network.