A safer, more common trick for Huawei V5 devices is modifying the WAP mode variable:
telnet 192.168.1.1
Once logged into the shell, type:
You are living in the "walled garden."
: This often requires a "Huawei ONT Configuration Tool" to push a specific firmware or configuration file to the device. Extract HW_tree.xml huawei hg8145v5 unlock