Release Fix iBooks DRM by Redsn0w 0.9.10b5 for idevice A4 only
Users who are already jailbroken with Redsn0w will just need to re-run Redsn0w (make sure you uncheck “Install Cydia” option) over the existing jailbreak for the iBooks resolution to filter across. Alternatively, downloading Corona version 1.0.6 (whenever it is available) from Cydia will have the same effect.
Download Redsn0w 0.9.10b5 for Windows
Download Redsn0w 0.9.10b5 for Mac