There are any number of EPUB readers available in the App Store,,There are any number of EPUB readers available in the App Store, I have no idea if any of them will work. I suspect it’s the 32 versus 64 bit issue that is going to rule the anything it currently in the App Store out.
Before I replied above I did a fairly extensive search (partly because I too have a very old iPod). While there are a lot of readers, all of the ones I saw required iOS 10 or later. That may indeed relate to the 32 versus 64 bit issue.
