If you’re thinking of updating your iPhone 4S or iPad 2 and expecting a jailbreak then you are pretty bit naive as iPhone Dev Team has addressed their concern on the upcoming iOS 5.1 which will be available later today according to Apple just now.
In a blog post made by the Dev-Team, they have warned iPhone 4S and iPad 2 users not to upgrade to the latest version if they want to keep their jailbreak feature as they would be unable to restore back to 5.01 version due to some security measures made by Apple.
Here’s what they’ve said in a full statement:
As the whole tech world waits for today’s Apple Event, it seems like a good time to remind both veteran and amateur jailbreakers about the fundamental rule of jailbreaking: Avoid firmware updates!
In all likelihood we’ll see the GM “gold master” version of 5.1 this week. DO NOT UPDATE TO 5.1, because you may lose your jailbreak! The rest of this post details the subtleties with this rule, but if there’s only one message to take home, it’s the overall “do not update” message! Now for the nitty gritty exceptions:
- 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.
As you can see, it really is a nuanced landscape so it’s sometimes hard to drive the message home to new jailbreakers. But the basic rule is the simplest (and it’s better to be safe than sorry!): If you update to 5.1 you’ll very likely lose your jailbreak, so don’t do it! Exceptions are noted above.
Now let’s see what Apple unveils today!
Apple just unveiled the new iPad with retina display of 264ppi, 2048×1536 display a moment ago. It also features a quad-core processor of A5X chip.