Rehabbing a PRS-500

I could use some help.

I've been cleaning my study and came across my PRS-500. I charged it up and it works!

I thought I would put some books on it and save my iPad batteries.

I expected that the Sony software would not 'see' it. I thought Calibre would work. But it doesn't see it either. I downloaded the recommended version and it still didn't see the reader.

I'm the kind that likes to use my electronics for as long as they work (yes, I still have working Minidisc players/recorders).

Any help is appreciated.

Kevin