The iPhone Dev-Team is cautioning jailbreakers to keep away from iOS 5. 1 which is able to download easily.
In all chance we'll see the GM "gold master" model of 5. 1 this week. DO NOT replace to five. 1, as a result of you can lose your jailbreak. the remaining of this publish particulars the subtleties with this rule, however if there's solely one message to take home, it's the general "do not update" message.
Now for the nitty gritty exceptions:
● quickly after 5. 1 seems on Apple's public servers (i. e. iTunes begins to supply it), Apple will cease signing 5. 0. 1 SHSH blobs.
● in case you have an iPhone4S, the essential rule above is actually the one rule: you cannot restore again to five. 0. 1 as soon as the 5. 0. 1 signing window is closed, irrespective of what (even in case you saved your SHSH blobs).
● in case you have an iPad2 with saved four. x hashes, you are able to in reality downgrade to that four. x however you won't give you the option to get to five. 0. 1 as soon as the 5. 0. 1 signing window is closed (even if you happen to saved your 5. 0. 1 SHSH blobs).
● in the event you have a tool sooner than the iPad2, you may downgrade to no matter model you want, so lengthy as you have saved SHSH blobs for that model. You'll want the help of geohot's limera1n exploit with instruments like redsn0w to get into "pwned DFU mode" and bypass the downgrade restriction.