Tried the NN746UC reload to fix my F700 black screen. Reading the image went fine. However, testmode would only load for a few seconds before reboot. Required reloading the WinCE files from the service menu.
Also, at least one user in another thread said that loading NN746UC will change your device number, rendering a legal 3.0 upgrade password unsuable in the future. I had the same experience. My device number DID change and my password is now invalid. I have to call Pioneer and try to get a password reset. Can this behavior be confirmed? If correct, users should be very cautious using the NN746UC fix.
I also can't say for certain that the NN746UC image helped my black screen. I was able to successfully reinstall 2.0; however, I may have had a corrupt or incompatible x910bt 3.01010 backup file that I first tried. In my case I don't know if the NN746UC reload was even necessary. I was frustrated and trying just about anything to get my F700 back running.