Kovid, I ran the code and the results are shown in the attachment below. I have installed version 0.4.68 of Calibre. After running the code, I opened Calibre; it now recognizes the Reader.

(That's me jumping for joy!)
I don't know what this code did, but whatever it did, I'm now back in business with Calibre.

More karma coming your way.
Sorry. I tried to give you more karma but I can't until I spread it around. System won't let me.