iOS: (Jailbroken) If you have a jailbroken iOS device, you might have noticed that iBooks either crashes when you try to launch it or struggles to properly display books you purchased from Apple. A new version of the jailbreak tool Redsn0w solves the problem.
In order to get iBooks working properly, you have to reinstall the jailbreak on your device with the new version of Redsn0w (Windows download, OS X download). Plug your device into your computer and run the application again. This time, uncheck the "install Cydia" box and let Redsn0w install. Once Redsn0w updates your device, you should have full access to a working version of iBooks again.