This is the most dangerous part of the process. Many websites offer infected or fake files.
Two main approaches:
Follow these instructions precisely. The process takes about 10–15 minutes. Zte Mf920u Unlock Firmware
Unlike a code, which flips a software flag in the NVRAM, unlock firmware replaces or patches the router’s operating system to: This is the most dangerous part of the process
Commonly distributed files are named like:
MF920UV1.0.0B02_Unlock.bin or MF920U_Generic_Unlock.webflash Follow these instructions precisely
This assumes you have downloaded a verified unlock firmware from a trusted source (e.g., DC-Unlocker, LTE Hacks forum).