2009 TDI with navigation continuously rebooting

Ok after researching this and my eye balls about to fall out i have the following problems

Turn radio comes up to welcome screen for a minute or so then fades to black and shuts off.

System:
OEM Head unit includes - back up camera, bluetooth and navigation as well as steering wheel controls. I have no idea what firmware update is on the vehicle i purchased used about 18 months ago my location is in North America. If the unit is salvageable then how would i go about fixing it. Should it not be salvageable where would i locate the wiring harness to hook up an aftermarket radio i have found the dash plate and the wiring harness for the steering wheel controls. I would like to keep the back up camera but its not a deal breaker. Thank you for your assistance.