Apparently, when you open iBooks on an untethered JailBroken A4 device through Redsn0w or Corona, you face a ‘configuration error’. Previously, we found out a solution which surpasses that error and let iBooks work. However, it seems that the method cause issues for syncing iBooks on iTunes. Pod2G has finally updated on his blog that he has been able to fix those iBooks and Sanbox issues which would be implemented in the upcoming update of Corona.
Corona is a tweak which lets you transform your tethered JailBreak into untethered. It means that it includes only patches which needs to be applied on a tethered JailBroken iDevice. On the other hand, Redsn0w performs all the necessary steps which you would require to untether JailBreak an A4 device from the scratch. It may also happen that Corona could be updated with the much awaited A5 untethered JailBreak which is still in development from the legendary hackers.
If you have been facing issues with either iBooks or Sandbox, all you need to do is to wait for a while again until the update is pushed. Also, you would no more need to use other alternatives after using Corona such as xBooks for the fix. @xvolks has worked with Pod2G to find both iBooks and Sanbox fixes into the Corona GIT. We would let you know once the fix is available in Cydia. Keep checking the blog for any updates on it.