There are two ways you can reset your VVX series IP phone to the factory settings:
You can also use a multiple key combination to reset your phone to the factory defaults. Depending on your phone model, press and hold the following keys simultaneously during the updater/BootROM countdown process until the password prompt appears:
Tip: Before UC Software 4.0.0, this multiple key combination only reset the device, clearing the flash parameters and deleting all log files. Within the updater, this is still true.