Well I messed something up. I went through the update screens, clicked start, and it only took a few minutes before it was on the screen where you check that NaviPersistence says "OK", which it did. After that I clicked "cancel documentation" and it just rebooted to the normal screen. I keep retrying the update, but now it doesn't seem to want to update NaviPersistence, it says "N" on the screen where you press "Start Download". Any suggestions? I'm making a fresh copy of the files on my SD card in case that is the issue.