Q: iOS 9.3.1 fix the iBooks problems?

So I wonder when Apple will fix this? In the meantime I'm going to try other ebook readers based on this Wikipedia article: Comparison_of_iOS_e-book_reader_software

Let me make sure I understand this:

1. Install iOS 9.3.1 (it re-boots iDevice after the installation)

2. Re-boot the iDevice again.

After step 2 ePubs will be synced again?

Oh, WHERE did you see this?

Well, THAT did NOT work; in fact it made things WORSE! iOS 9.3.1 not only will NOT add ePubs but it deletes EVERY ePub except those purchased from the iBooks Store INCLUDING Apple user guides downloaded from Apple Support - Manuals!

I don't use iCloud Sync. I use iTunes via USB. OK, I just tried rebooting the iPhone a third time and the non-iBooks Store Apple ePubs reappeared but no NON-Apple sourced ePubs.

According to this Wikipedia article, https://en.wikipedia.org/wiki/Comparison_of_iOS_e-book_reader_software#Supported _File_Formats, Marvin is ePub only; it does not support PDF or any other format. I searched on the Appstafarian website but did not see any mention of any format except ePub other than you can use Marvin to export your ePub books to PDFs. So you'll probably have to stick with iBooks for PDFs and Apple-sourced ePub books.