Soft Reset (Does not delete Data) Hard Reset (Deletes stored data)
Optima Reset 1. Turn unit OFF 1. Turn unit OFF
2. Press and hold the EXIT key 2. Press and hold the LEFT & RIGHT arrow keys
3. Press and hold the PWR key 3. Press and hold the PWR key
4. Release both buttons when the unit powers up 4. Release both buttons when unit powers up
The above was obtained from the 1st link below.
Try the soft reset first.
If nothing, try the hard.
The 2nd link below is the manual, but it says nothing in the troubleshooting section of your problem or how to reset to factory settings.
But it does give you factory contact information.
Good luck.
Mac
http://www.eaglenav.com/en/Support/Troubleshooting-Guide/Reset-Procedures/http://www.eaglenav.com/upload/Eagle/Documents/Manuals/optima.pdf