After the release of Redsn0w version 0.9.10b5, offering Untethered Jailbreakfor iOS 5.0.1 users, the b5 version rolls in yet another fix for iBooks. Earlier @Pod2g had mentioned on the fix with upcoming Corona 1.0-6 but Dev Team has successfully been able to fix the iBooks DRM issue with Redsn0w 0.9.10b5.
RedSn0w has integrated a utility called “crazeles” which overcomes Jailbreak detection by iBooks that would cause approx 10% of images to show incorrectly. This means you don’t need to wait for Corona 1.0-6 and simply solve the iBooks problem with RedSn0w 0.9.10b5.
In addition, the fix is seen similar to the “hunnypot” fix that @comex wrote for the 4.x jailbreak. If you want to re-jailbreak your iDevices with Redsn0w 9.10b5 to fix DRM issue then you need to do the Jailbreaking process again but without selecting the Install Cydia Option.