[klu529]

Glad you were able to find your books. If you want to read them on your computer, you'll need to install an e-reader program first, one that supports epub files. Almost all do, the only exception I know is the Amazon Kindle for PC program. Calibre has a built in program you can use as well. Here is a quick how-to for Calibre.

Install the program, run it. It should be blank. In your file explorer window, find your epub or other ebook files and drag them to the Calibre window. The program will create a copy of these books and organize them. They will get saved to your computer's "Documents" folder under "Calibre Library" and be organized by the author. If you don't have them on your computer, just connect your ereader to the computer after Calibre is running. Calibre will scan your device automatically and show you the books it found. You then select the ones you want and add them to your library, this copies them to the computer so you can read it from there or transfer them to another device.

PS. As for the firmware, I don't know they are compatible between the black and white ones. That could be why it didn't work when you tried before.