I also encountered the endless reboot loop...

Previous SSU's did work without a glitch, but this time it didn't. I don't think I have anything "strange" installed on my tablet. Certainly nothing on the "list of 5" things mentioned earlier in this thread.

I'm right now traveling and didn't take the USB cable with me. Luckily the hotel I'm staying have miscellaneous chargers and cables, and they happened to have the Nokia Micro-USB cable... so I was able to reflash using my work laptop. After reflashing the SSU updates worked fine.

To think something positive... I was planning to do a fresh flash anyway to get a clean (no restore backup) install. Now I got a good excuse to do it...