But be warned: Flashing the wrong firmware can your MF920U (turn it into an expensive paperweight).
If you choose the firmware route, ensure your PC meets these basic requirements to avoid connection interruptions: MF920U Quick Start Guide - FCC Report zte mf920u unlock firmware top
For 99% of users, buying a used MF920U on old firmware (B10 or lower) is cheaper than paying a technician for a hardware unlock. But be warned: Flashing the wrong firmware can