If you're trying to read them on an iPod Touch (or iPhone or iPad) then there is no such thing as OS 10.9 as 9.2.1 is the latest version of iOS (even for the most current devices) not sure why iBooks in iOS would give you a message like that. OS 10.xx would refer to the Mac OS X for a computer (current version is 10.11.x "El Capitan"). OS X 10.9 "Mavericks" was the first desktop Mac OS to have iBooks IIRC.
Last edited by AnemicOak; 01-20-2016 at 10:09 PM.
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