[BrotherHead]

Originally Posted by kovidgoyal

That's an error sending a file to the device. If the cable didnt fix it, then your reminaing options are to do a reset or use one of the wireless transfer options https://manual.calibre-ebook.com/faq...kindle-fire-hd

Thank you very much. I rebooted the Nook to factory settings and it fixed almost all my problems.

I can now upload books to my main memory with no problem and I can open Kindle with no problem.

Right now, I still can't see the books I've uploaded and my Calibre can't seem to see my SD card.

If you have any suggestions of what I might be missing, it would be greatly appreciated.

But thank you again for your help.