The beta version of iOS 5.1 has been circulating among developers, but we had not yet heard about the Golden Master, until today. In the beta release there was no indication that the IOS 5.1 would be released in March. Today ChronicWire finally said that the beta of iPhone OS 5.1 has reached Golden Master status, and today we may see the announcement of immediate availability of iOS 5.1 Golden Master.
The iPhone Dev Team has posted a word of wisdom to potential jailbreakers to stay away for the time being.
- Soon after 5.1 appears on Apple’s public servers (i.e. iTunes starts to offer it), Apple will stop signing 5.0.1 SHSH blobs.
- If you have an iPhone4S, the basic rule above is really the only rule: you cannot restore back to 5.0.1 once the 5.0.1 signing window is closed, no matter what (even if you saved your SHSH blobs).
- If you have an iPad2 with saved 4.x hashes, you can in fact downgrade to that 4.x but you won’t be able to get to 5.0.1 once the 5.0.1 signing window is closed (even if you saved your 5.0.1 SHSH blobs).
- If you have a device earlier than the iPad2, you can downgrade to whatever version you want, as long as you have saved SHSH blobs for that version. You’ll need the assistance of geohot’s limera1n exploit with tools like redsn0w to get into “pwned DFU mode” and bypass the downgrade restriction.