: Some tech-savvy users opt for installing custom firmware on their ZTE MF920U. This method involves flashing a new firmware image onto the device, which can unlock it and add new features. However, this process is risky and can permanently damage the device if not done correctly.
Using PuTTY or Serial Terminal (baud 115200), send: AT+ZSNT=0,0,0 (forces full network scan). Response should be OK (locked devices return ERROR ). zte mf920u unlock firmware top