If you accidentally erase the IMEI, your device may become illegal to use in some countries. Always choose "Write Firmware Only," not "Full Erase."
Unlocking the via firmware allows you to break free from carrier restrictions and use the device globally. However, it is a technical process that requires caution. If you are not comfortable with flashing software and risking the device, purchasing an official unlock code is the safer, albeit paid, alternative. Zte Mf920u Unlock Firmware
The unlock process involves the following steps: Bottom Line Up Front Critical Warning: If you
Bypassing a carrier lock to avoid device payment is illegal. Only unlock fully owned devices. Zte Mf920u Unlock Firmware