Audiobooks won't delete/upload

All of a sudden, I can’t delete loaded audiobooks, nor upload new ones. 

Tried to update the firmware but it didn’t update. V 1.01.21A

 I have reformatted several times.

I got  the newer Sport, but it doesn’t support chapters the way this one does, so I returned it. I got the Zip specifically for downloaded audio books because the back or next button gets you to the next chapter.

I got  the newer Sport, thinking my Zip was toast, but it doesn’t support chapters the way this one does, so I returned it

Is there a way to fix my Zip? Any recommendations for a player that supports chapters?

Thanks all