The latest untethered jail break for iOS 4.2.1 in greenp0ison is now available on Mac OS X.The jailbreak fixes a major issue where rebooting after a tethered jailbreak would undo the hack after initial application as well as making it permanent, with compatibility on iPhone 3GS and iPhone 4. For those that complete the initial steps and can’t complete outside of the “greenpoison initializing” screen, restart and keep holding the home button well after the complete message is displayed.
