I've had a problem with updating mine too.
I first downloaded the firmware yesterday (AVIC- 5000,6000,7000NEX_UC_FW-Update_v1.10), when to do the update, went from 0% to -1, then instantly failed. Now I can't get the radio out of that screen (every time I start the car it tries to update). I've tried resetting the radio with the small button at the front with no luck.
I thought it might have been a firmware issue, so I went to re-dl the firmware from the site, now it only gives the 1.08 software (AVIC-5000,6000,7000NEX_UC_FW-Update_v1.08), no matter which link I try (although the site