看見標題時先別失望，看完整篇文章再說！早前 Dev-Team 表示把聖誕定成 Deadline，會在 12月 25 日前推出 iOS 4.2.1 的 untethered jailbreak！不過，最近的消息是 Dev-Team 未能在聖誕前完成「這個方法」的 jailbreak，但會有 Backup plan 頂上，則我們仍會在聖誕前得到 iOS 4.2.1 untethered jailbreak！
Over the Christmas weekend we’ll be releasing a version of redsn0w that implements the “backup plan” to the 4.2.1 untethered jailbreak. We’re seeking your help to test this redsn0w and find any bugs before we do a general release!
(If you have an iPhone 3G, or an old-bootrom ipt2g or iPhone 3GS, you already have an untethered jailbreak! Just use the latest public redsn0w.)
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 you fit all the above qualifications, please follow @redsn0w_testers ontwitter for announcements, and use the comments section here for feedback. Thanks very much for your help, and Happy Holidays!
Untethered 4.2.1 JB on ipt4g