There is a
useful plugin that allows paranoid users like myself to connect their PW2 to Calibre through USB while running KOReader.
However this requires the
USBNetworkHack.
If I am not mistaken it is an old hack to jailbreak the firmware of the Kindle. But can it still be run safely on an already jailbreaken Kindle PW2 running 5.12.2.1.1 (latest version at this date) ?