Following a week of successful backups I was cycling through cards again to pick up any missed backups. On the first 3 SD cards it said they were identical and I chose to eject the card. Upon inserting the 4th card, it started checking the card and hard locked. The "hold the button for 7 seconds" thing didn't do anything. I had to open the case and disconnect the battery with a pair of needle noise pliers. Reconnecting the battery returned the unit to proper functioning and I was able to connect the NPS-10 to my PC over USB and download the accumulated images successfully. Is there a better way to reboot a hard locked device?