Greenpoison RC6.1 Jailbreak Brings iBook Error Fix to 4.2.1
Now, Chronic Dev updated their Greenpoison to version RC6.1, and included the fix too.
Well, Comex figured it out. The system checks if the OS allows execution of unsigned binary, and if it does, the books won’t open.
If you were using Redsnow for 4.2.1 or Greenpoison RC5 all you have to do is run Greenpoison RC6.1 over your existing jailbreak. No need for restore or any other extra measure.
If you are confused, you can use our Greenpoison RC5 tutorial and adapt it for Greenpoison RC6.1
Download Greenpoison RC6.1 for Windows here
Download Greenpoison RC6.1 for Mac here