Zte Mc7010 Firmware Upd -

The MC7010 is unique because it is often supplied by mobile carriers (Telstra, Optus, T-Mobile, etc.) or purchased directly from ZTE. Each variant may have different firmware locks:

Many MC7010 units have anti-rollback protection. Once you flash B20, you cannot go back to B12. Attempting to do so will brick the device. Zte Mc7010 Firmware