Fibocom L850gl: Change Imei [new]

Click Start, type "cmd", right-click on "Command Prompt", and select "Run as administrator".

for IoT development and network testing within legal frameworks.

This post is for educational purposes only. Changing the IMEI of a cellular modem is illegal in many jurisdictions (e.g., EU, USA, Canada, China) unless you are the original equipment manufacturer or a licensed repair center with legal justification (e.g., replacing a broken modem with a donor IMEI from an identical, legally owned device). Modifying an IMEI to bypass carrier blacklists or evade tracking is a serious crime. Proceed at your own risk.

Most consumer-grade Fibocom L850-GL modules shipped by Lenovo or HP have locked NVM sectors. To bypass this, developers often resort to downgrading the firmware to an unlocked factory or engineering state. fibocom l850gl change imei

Modifying an IMEI is strictly illegal in many jurisdictions, including the United States, Canada, the United Kingdom, and member states of the European Union. It can carry severe penalties. Many technical forums, including XDA Developers, have closed discussions related to IMEI modification due to its illegality.

Users typically attempt IMEI changes on this module using two primary methods: 1. Manual AT Commands

Changing the IMEI of a Fibocom L850GL module can have risks and implications: Click Start, type "cmd", right-click on "Command Prompt",

Flashing firmware or sending incorrect AT commands can permanently brick your Fibocom L850-GL module, rendering it useless.

Configure the terminal to connect to the same COM port you found for the modem in Device Manager. The typical settings are 115200 baud, 8 data bits, no parity, 1 stop bit (8-N-1).

: Restoring an original IMEI to a replacement module to match the label on the device chassis (often called "IMEI Repair"). Critical Risks Changing the IMEI of a cellular modem is

AT+CGSN < current_imei >

Overwriting the old number with a new, valid IMEI (often from a donor device).

Switching USB modes can sometimes cause the device to vanish from the OS. Always keep your original AT+GTUSBMODE value handy to revert the modem to its standard laptop-integrated state.

Fibocom offers a tool called or Fibocom Engineering Toolkit to authorized partners. This tool, together with a signed "NVM Package", can re-write the IMEI. The process requires: