看到版上部分朋友jb後又上4.3卻沒有備份SHSH
以下資料參考看看吧
OS 4.2.1 SHSH認證已於3/11晚上關閉發送！
iOS 4.2.1 signing is really closed
Looks like Apple has stopped signing 4.2.1 for all devices that can run 4.3. As a result TinyUmbrella needs a small update (until i fix the code that handles that). Sorry for the update. This is the last time you guys will need to update for this case. In the code, currently, I use an enum to determine the hardware and the associated ‘current’ iOS firmware for each hardware. Yes this is inefficient. I don’t need a reminder. Tonight is not the night to fix that as it is all bundled together in a much larger refactoring that I’m smack in the middle of. This update should help those of you having problems ‘saving’ 4.3 while Cydia is unchecked.
來源 http://thefirmwareumbrella.blogspot.com/
這是意料之外的事,每次在新的iOS推出後,幾乎當天便會關閉對之前版本的認證發送,這消息意味著您若未備份4.2.1SHSH,若有天不小心玩Cydia當機白蘋果或是不小心手養升級,那您只能等待下次越獄工具推出,有就是4.3越獄工具！但下一版的越獄工具,因為iOS 4.3 beta已經加入了ASLR保護。目前 iPhone Dev Team 的駭客i0nic 已經對iPad iOS 4.3達成完美越獄測試,除 i0nic 外， pwn2own 及 comex 正在採用其他方式破解 iOS 4.3 ，提供更多的 Untethered Jailbreak 破解方案，同時 Greenpois0n 正在進行更新版本，讓程式可升級至支援 iOS 4.3 ，所以想升級 iOS 4.3 的用家相信不需要等待太久了。
來源
http://www.allabtmen.com/?p=1240
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