Originally Posted by kahowson
I'm having the same issue, running on a Mac (PRS-500).
Is your 500 upgraded to the new epub firmware?
If this is the old (non-epub) firmware for the 500 then Kovid says
to stick with 0.6.29 which you can find here
. Version 0.6.29 is the last version of Calibre that supports connecting to the PRS-500.