Redsn0w 0.9.7 developed by the iPhone Dev Team that is currently available for beta testing – needs iOS 4.2 beta3 SHSH blobs, which is a major problem as it limits the number of users who can use it (as beta versions of iOS is only available to developers of iOS Dev program).
iPhone Dev Team have recently announced that they’re planning to address this issue as they’ve managed to successfully port the Monte technique to iOS 4.1.
iPhone Dev Team revealed this via the following tweets:
Ported Monte back to 4.1 kernel (SHSH blobs). Next step: porting it forward to 4.3beta!
MuscleNerd has provided some more details about the Monte technique:
@Harchu30 the beauty of Monte is it doesn’t expose any new exploits 🙂 It makes the entire “wait until next FW” concern moot
@digitaldj yep! The concept behind Monte-4.1 is to look exactly like stock 4.1 until pwnage, then switch over completely to 4.2.1
Think of Monte as a “green” jailbreak. It recycles (for example) 4.1’s exact JB exploit on 4.2.1 🙂 Waste no exploits.
This means that users will be able to use Redsn0w 0.9.7 to perform an untethered jailbreak of their iPhone, iPad or iPod Touch on iOS 4.2.1 using iOS 4.1 SHSH blobs (which would have been automatically saved by Cydia if you had jailbroken your iOS device while it was running iOS 4.1).
Meanwhile, Chronic Dev Team have also announced that they’re planning to release an updated version of greenpois0n to jailbreak iPhone, iPad and iPod Touch on iOS 4.2.1. The jailbreak will be untethered and doesn’t need SHSH blobs.
There is currently no ETA available on when the updated version of greenpois0n and Redsn0w for iOS 4.2.1 will be available.Dev Team]