Resetting Device to Factory Default will erase all the user’s configuration, preference,
database and profiles on the device and restore the device back to the state as factory default.
To perform a factory default reset, user should press [Menu] >> [Advanced],
and then input the password to enter the interface.
Then choose [Factory Reset] and press [Enter], and confirm the action by [OK].
The device will be rebooted into a clean factory default state.