iPhone Dev Team started a redsn0w beta program for users to test untethered iOS 4.2.1 jailbreak which required 4.2B3 SHSH Blobs. This wasn’t intended for mass users as it contained bugs and also required installation of some tool. However, things have moved on and redsn0w 0.9.7b4 will be released today. It will be a more stable release as users’ feedback had helped iPhone Dev Team improving the jailbreak. Today’s build will also include usbmuxd by default but will still be available for MAC only. The next build [redsn0w 0.9.7 b5] will expand to Windows as well.
Remember that this untethered jailbreak was a backup plan and more efficient jailbreak by @comex is still not out. It will likely be released to jailbreak 4.3 as iOS 4.3 is not very far.
Source: CrispyTech
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