Interesting: calibre 0.6.26 reports my PRS-500 back as being firstly a Pocket Edition then as a 505.. I wonder which one is closer to the truth? Doesn't matter very much, it works great

With a new install of calibre now, should I select PRS-500 or Pocket Edition in the wizard?
Another thought: the PRS-500 Operation Manual - should someone unofficially update it for the PRS-500 with new firmware?