Only a rare subset of modems (SecureLevel 0) can be modified using the standard methods found on forums like 4PDA .
Настройка поддержки модема Fibocom 850/860 в OpenWRT fibocom l850gl change imei work
For those using the L850-GL in a router, the OpenWRT community has developed scripts like xmm75xx-info or IMEIChanger to interact with the Intel chipset. 3. Diagnostic Mode & QCN (Snapdragon-style) Only a rare subset of modems (SecureLevel 0)
The main hurdle for the L850-GL is a security feature called . fibocom l850gl change imei work
However, the Fibocom L850-GL is built on an Intel XMM chipset, making IMEI modification significantly harder than on Qualcomm-based modems. The Technical Challenge: SecureLevel
You can try sending commands through a terminal like Putty or a specialized AT Command Tool . AT+EGMR=1,7,"YOUR_NEW_15_DIGIT_IMEI"