The following special reset or operational modes can be accessed by holding down certain keys during the powering up process:

Dead-Poll

Hold the Ctrl key to boot into dead-poll.  Used primarily when a software upgrade has not executed correctly.

Reset Factory Settings

Hold the F1 key to reset the device settings to factory defaults. The factory defaults are only active until the next power up unless deliberately saved by the user.   This option is useful when there is a setup issue that prevents the user from modifying the device settings using the built in Settings Editor.  

Format CONFIG & Reset Factory Settings

Hold the F1 and F3 key to format the CONFIG file system and to reset the device settings to factory defaults. The CONFIG file system is formatted and cannot be undone. The factory defaults are only active until the next power up unless deliberately saved by the user. This option is useful when there is a setup or configuration issue that prevents the user from modifying the device settings using the built in Settings Editor.