iBooks issue on Jailbreak iPad

If your iPad runs iOS 4.2.1 and has the new iBooks update, some users have troubles opening their purchased books within the iBooks app. Because your iPad is Jailbroken.When you open an ebook for reading on jailbroken device, your device can read and executes unsigned code, and you will get a silly little pop up message.To fix the iOS 4.2.1 Jailbreak DRM Problem, you can use "iFile" to get back