So after replacing the battery in my F type today I had no audio, nav or phone connection bluetooth. Tried disconnecting battery and reconnecting 3 or 4 times, with no luck, checked the fuses in the boot all good, disconnected the 2 plugs going to the fuse bank still no luck. Went on Google and some forums that said about holding the power button on the infotainment system down for 30 seconds to do a hard reset,this didn't work either. So in desperation I tried it again for longer about 1 or 2 minutes it did power down but still no audio etc, only after holding the power button down for about 4 or 5 minutes did the radio and everything burst into life, all the presets still there and the stored cds. I'm doing the lottery tonight 
hope this helps someone.
hope this helps someone.