With Chronic Dev Team help we present Greenpois0n RC6.1 for both Mac OS X and Windows. This version has successfully patched with iBooks fix. For who don't know, many users have problems with iBooks after jailbreaking iOS devices with Greenpois0n.
How to know that you have been infected? If you saw this message “There is a problem with the configuration of your iOS Device. Please restore with iTunes and reinstall iBooks“ so your iOS device has been infected.
How to solve? You have to restore your iOS device and re-run Greenpoison RC6.1 jailbreak again, you can follow our step by step guide found here.