iPhone Dev Team’s key member MuscleNerd has updated his popular jailbreak tool Redsn0w 0.9.10 b4 which includes fix for broken iBooks on already jailbroken iOS 5.0.1 devices.
Earlier today we reported about the the update of Corona 1.0-5 by Chronic Dev Team which also fixes the broken iBooks on iOS 5.0.1 but Corona is available through Cydia store only.
If you are jailbreaking your device for the first time, you will have to use Redsn0w 0.9.10 b4, which will do all the jobs but if you have already jailbroken device, you should either re-run Redsn0w on it or install Coronal Package from Cydia.
Here is the official update from iPhone Dev Team:
Update #4: The b4 version of redsn0w incorporates the 5.0.1 fix for iBooks, and also for sporadic problems with launchctl. Thanks to @xvolks for merging the iBooks (sandbox) fix from @comex’s github into the overall corona untether from @pod2g! As usual, you can choose to install the fix either by re-running redsn0w over your existing jailbreak (de-select Cydia if you do that), or by installing the corona package from Cydia (it’s the same set of files no matter which way you choose).
TIP: If auto-detection fails and redsn0w tells you no identifying data was found, you can always pre-select the appropriate 5.0.1 IPSW using “Extras->Select IPSW”.
Download Redsn0w 0.9.10 b4:
[...] every hacker, researcher and developer updates his jailbreak tools and apps to support it. As iOS 5.0.1 untethered jailbreak for iPhone 4, iPad 1, iPhone 3GS, iPod Touch 3G and iPod Touch 4G is now available, iH8sn0w, the [...]