Developers on 4pda and XDA-Developers are working on a "semi-unlock" using a modified db_user_cfg.xml that unlocks hidden menus without replacing the whole OS.
If you have landed on this page searching for the term you are likely tired of restricted admin menus, blocked bridge modes, or the inability to change your DNS or Wi-Fi password. You want full control. Zte Zxv10 B866v2 Unlock
Since the output is too fast to read, copy it to a USB drive or use grep to find the password: Developers on 4pda and XDA-Developers are working on
grep -i "password" /userconfig/cfg/db_user_cfg.xml Look for a tag like <Value name="Password" rw="RW" value="**[Encrypted]**"/> . Sometimes it is plain text; often it is base64 encoded. Since the output is too fast to read,
For the enthusiast who demands root access, the is your best bet. If that fails and you are comfortable soldering, the UART method (Method 4) is the only guaranteed way to regain control.
cat /userconfig/cfg/db_user_cfg.xml This outputs a massive XML file to your screen. It contains the actual Super Admin password.
For the average user, buying a cheap $30 router and placing the ZTE B866V2 in "DMZ mode" (even user mode DMZ) is safer and achieves 90% of the same results.