You can now install Corona to use iBooks on your iOS 5.0.1 untethered jailbreak.
If you have been debating updating to iOS 5.0.1 and jailbreaking untethered because of the fact that you're an iBooks-a-holic, then you should download the newest Corona update. It has been updated to patch iBooks from a kernel level so that you can read your iBooks purchases on your iOS 5.0.1 untethered jailbroken iDevice. Before today, there were sandbox problems that would have prevented you from doing so.
If you are jailbroken from the original Corona untether, then you can simply update the package to get your iBooks patch. It will require a reboot after installing. If you are jailbroken untethered already using the latest redsn0w, then you can simply install Corona over the untethered redsn0w jailbreak for iOS 5.0.1 and the iBooks patch will take affect immediately. The sandbox fix for iBooks comes from a patch made by comex, but comex was not the developer behind the Corona update.
Corona was updated to version 1.0-4 which originally fixed iBooks, however there was another launchd problem that was fixed in it and additionally users weren't restarting their iDevice after installing it so they were complaining that the patch did not work. Because of this, Corona 1.0-5 was released (current version) that not only fixes iBooks, but also fixes the launchd problem again (as cited by saurik), but it will also force you to reboot your iDevice so that the patch will certainly work effectively.
Corona, even with this update, is patched in iOS 5.1 and we highly recommend that you update to iOS 5.0.1 and get your untethered jailbreak as soon as possible. This is especially so with those of you who have been waiting for an iBooks fix in order to update. There is no reason not to update if you have a newer iDevice sometime this week because pod2g just posted today, proof of an untethered jailbreak for the iPhone 4S which means that the A5 unethered jailbreak is very close to being released.
Corona 1.0-5 will patch all of the following jailbroken devices running iOS 5.0.1:
- iPhone 4
- iPhone 3GS
- iPod touch 4G
- iPod touch 3G
- iPad 1