RedSn0w 0.9.7b1 is out now to untethered jailbreak iOS 4.2.1 on iPhone 4, iPad and iPod Touch 4G. Follow the instructions below to jailbreak iOS 4.2.1 untethered on iPhone 4, iPod Touch 4G and iPad using RedSn0w 0.9.7b1.
According to MuscleNerd, Untethered Jailbreak for iOS 4.2.1 with RedSn0w is about ready. The New RedSn0w will not only jailbreak iOS 4.2.1, already jailbroken (tethered) users can use this new RedSn0w to re-jailbreak to get untethered support without any restore (all installed jailbreak tweaks will stay).
Dev-team and Comex has confirmed that untethered iOS 4.2.1 jailbreak will be out before Christmas 2010. First MuscleNerd came up with a video demonstrating untethered iOS 4.2.1 jailbreak on iPod Touch 4G.
Redsn0w 0.9.6b5 can jailbreak iOS 4.2.1/4.1 and update iPhone 3GS / 3G baseband to 06.15.00 which is unlockable with UltraSn0w 1.2. Those iPhone 3GS/3G users stuck with Baseband 05.15.04 & 05.14.04 need to update baseband to the iPad baseband 06.15.00.
Dev-Team has release RedSn0w 0.9.6b4 to jailbreak iOS 4.2.1 on iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad. RedSn0w 0.9.6b4 jailbreaks iOS 4.2.1 with working Cydia and MobileSubstrate. Step-by-step instructions on how to jailbreak iOS 4.2 with RedSn0w 0.9.6b4 after the jump…