For ISP-locked devices where standard passwords fail, users have verified a method using to reset the internal configuration to a "stock" state:
Accessing the full settings.
这种方法虽然不是完全的 Telnet 解锁，但对于仅需要开启桥接模式或修改一些隐藏选项的用户来说，。 how to unlock zte f670l verified
If the default passwords do not give you full control, you can unlock the device by dumping and modifying its configuration file. A. Enable Telnet Access For ISP-locked devices where standard passwords fail, users