A quick fix is now available in Cydia store that lest you read the DRMed / rightfully purchased iBooks on already jailbroken device on iOS 4.2.1.
Though the latest PwnageTool 4.2 version and Snowbreeze 2.2 version also resolve the problem while building custom iOS firmware but you have to restore to this custom iOS – a time consuming task.
The solution available in Cydia Store fixes the iBooks on iOS 4.2.1 devices jailbroken with Greenpois0n without needing restore and re-jailbreak.
Here is how to install iBooks Fix.
Step 1: Tap on Cydia icon and go to Manage -> Sources -> Edit -> Add.
Step 2: Type the address of Insanelyi repositr0y and tap on “Add Source”.
Step 3: Search for “iBooks Fix” and install it.
After installing the iBooks Fix you can read the purchased content from iBookstore including Winnie-the-Pooh.
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