I have put up a few other post but alas no help so I tried some SDMLC imgages to try and recover my unit. Being an American unit I first tried the SDMLC nn746 also the nn749 all types, the EW,RE,and the UC versions.I had no icons in the AV screen, so on tuner or sirus etc. The screen was reversed meaning that when I touched te screen it would show the touch on the other side. I finaly found this one NN746UC_SDMLC_0_108009984 and it worked. I put in Australian maps and pio etc that I hade on my SD cards (I had to rename their extentions the .000 to .001 etc to allow me to join them using a file