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 for the 4.x jailbreak. 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).
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