Use the following steps to reset the ATV312 to factory settings:
From the default display, press Enter
Turn to menu drC, press Enter
Turn to parameter FCS, press Enter
Turn to setting InI, press and hold Enter for 2 seconds
From the default display, press Enter
Turn to menu drC, press Enter
Turn to parameter FCS, press Enter
Turn to setting InI, press and hold Enter for 2 seconds