iPhone Dev-Team just confirms that untethered iOS 4.2.1 Jailbreak Monte has been ported to iOS 4.1 SHSH blobs. It means now you don’t need iOS 4.2b3 SHSH blobs to jailbreak iOS 4.2.1 with RedSn0w 0.9.7 beta. Indeed a great news for all those who have iOS 4.1 SHSH blobs saved and want untethered iOS 4.2.1 jailbreak.
For those unfamiliar, Jailbreak Monte in RedSn0w 0.9.7 beta provides untethered jailbreak for iOS 4.2.1 firmware but it required iOS 4.2 beta 3 with SHSH blobs saved for it (beta firmwares are available to developers only). Now that Dev-Team has successfully ported Jailbreak Monte to iOS 4.1, which is publicly available, so anyone with iOS 4.1 SHSH blobs saved will be able to enjoy untethered iOS 4.2.1 jailbreak.
MuscleNerd also calls Jailbreak Monte a ‘Green Jailbreak’ which uses the same iOS 4.1 exploit to jailbreak iOS 4.2.1. So, no new exploit wasted.
Dev-Team is now working on porting the same Jailbreak Monte to iOS 4.3 firmware.
Note: If you do NOT have iOS 4.1 SHSH blobs saved you cannot use Jailbreak Monte technique, sorry. RedSn0w 0.9.7 currently supports Mac OS only, Windows version is still in development.
Greenpois0n is also expected to be released soon to jailbreak iOS 4.2.1 untethered. We’ll keep you posted as soon as RedSn0w 0.9.7 new beta and Greenpois0n is out to jailbreak iOS 4.2.1 untethered using iOS 4.1 SHSH blobs. Stay Tuned!