There's several reasons to reset your box to factory defaults. You can do it one of two ways.
Reet through pfSense
To reach pfSense, go to https://ovpnbox.com:444. Once you're logged in, you can reset your box by going toDiagnostics -> Factory defaults -> Yes. Your box will now restart and restore factory defaults.
Reset using a screen
The second way to restore factory defaults is by plugging in a screen and keyboard to the box. Once that is done, start the box up and wait until the menu loads. You can restore the box to factory defaults by selecting option 4 in the menu.