Few hours after the release of Corona 1.0-6/7, Saurik has updated that they have released Corona 1.0-8 version as the earlier version was facing issues with iPhone 4S running 5.0.
Those users who have missed the Corona 1.0-7 version, which includes the fix for iBooks, must install the Corona 1.0-8 as Saurik has yesterday highly recommended that all jailbroken devices (except iPhone 3GS with old bootrom) MUST install Corona 1.0-7 (now Corona 1.0-8), no matter how they have jailbroken their device.
If you are not aware: Corona 1.0-7 was released, which overcomes the iBooks broken and no image bugs appearing on jailbroken devices. The issue was observed in all jailbroken devices. The alternate method to fix the issue was released in the form of updated redsn0w 0.9.10b5 version by Dev Team.
On the other hand, the CDT has updated Corona that includes the same set of files used in redsn0w. The steps to update the Corona remain same and can be found here. For more updates and fixes stay connected to us on Facebook, Twitter, and Google+.