Search for a related thread titled "Software Update Ignored". The unit is finicky regarding the card used, and even after you find a card that works, it may not work (update) every time. Suggest you delete the files on the SD card and reload as I noticed the update process, successful or not, was adding an empty dir to the card (forget the name). Seems the older, smaller SD cards work better that others. When you get a card that works, put it in a safe place! I posted a thread a yr or so ago w/ other info on this; for get the title and I've not yet figured out how to link to other threads yet.