With Comex not able to finish his planned iOS 4.2.1 untethered Jailbreak in time for Christmas, MuscleNerd and the iPhone Dev-Team are pushing ahead with a redsn0w "backup plan" and are looking for a few good, qualified testers.

To keep things manageable, this will be a Mac-only test program. We also request that any volunteers NOT need the ultrasn0w unlock (in case things go very wrong).

Right now, the “backup plan” requires that you have the 4.2b3 IPSW on your Mac, and that Cydia has your 4.2b3 SHSH hashes. Please don’t pirate that 4.2b3 IPSW! (We’re also working on a way that this technique might apply to all those with 4.1 IPSWs, but that’s not the first goal right now.)

If they're talking to you, follow @redsn0w_testers on Twitter for more information, and send them feedback via the link below. Meanwhile, let us know how it works for you!

(If you're not sure what any of this means, check out our Jailbreak starters guide first!)

[iPhone Dev-Team]