The iPhone Dev-Team has updated RedSn0w 0.9.10b5 which includes another fix for iBooks by planetbeing.
The new redsn0w version b5 incorporates yet another fix for iBooks, this time involving DRM. @planetbeing wrote a utility called “crazeles” that overcomes jailbreak detection by iBooks that would cause about 10% of images to show incorrectly.
This fix is similar to the “hunnypot” fix that @comex wrote. RedSn0w 0.9.10b5 – 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).
The Dev Team notes on its blog that:
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”.