iOS 5.1 Tethered Jailbreak

Update 3/9/12 If you’re using ‘Spire’ to use Siri on your non-iPhone 4S phone, note that ‘Spire’ probably will NOT work with iOS 5.1. ‘Spire’ works by installing Siri from the official iOS 5.0.1 IPSW for the iPhone 4S – this was possible only due to Apple forgetting to encrypt something from the codes and very likely have patched up the exploit with iOS 5.1.

Update 3/9/12 Redmond Pie posted a neat How-To tutorial about how you would go about jailbreaking  your non-A5 devices. Check it out! Make sure you read the notes below you proceed, however! :)

Not even a full day since Apple announced the iOS 5.1 and we already have a jailbreak…for ‘select’ number of folks under certain conditions.

If you’re new to the world of jailbreaking your iPhone, there’s one rule that you should always be mindful of – avoid firmware updates.

This reminds me of an analogy by iDownloadblog back in 2010:

An underground group of programmers known as the Dev Team, for the most part, spearheads all this jailbreak technology more or less without Apple’s permission. Think of the Dev Team as the LA SWAT team with huge awesome guns trying to get into a barricaded building, which is the jailbroken iPhone software.

Every time they find a way in, Apple comes along and puts another barricade up with a software update that closes the entrance they had. Then they have to find another way in.

English: Hard way to Jailbreak a phone.

Image via Wikipedia

Anyway, getting back to the details of the iOS 5.1 jailbreak, yes it’s available but it’s a tethered jailbreak for non-A5 devices. This means that you will need to connect your iPhone to your computer each time you reboot your iPhone.

Personally speaking, I don’t like tethered jailbreaks. I’m the type that reboots his iPhone ever so often, for no particular reason really, and I don’t want to be stuck in a situation where I’ve habitually rebooted the iPhone to an unusable state.

For folks with A5 devices (iPhone 4S, iPad 2), we’re going to have to wait a while longer with no estimates when we will see the jailbreak.

**Just a quick note, before we go further with the details of the tethered jailbreak – while jailbreaking does offer some unique tweaks that aren’t offered with native Apple iOS versions if, for example, you take it to the Apple Store to get it repaired and the Genius notices that you’ve jailbroken your phone, Apple will void your warranty then and there. There are a number of things than ‘can’ go wrong with the process of jailbreaking, so please do not proceed further if you’re unsure of anything stated above. Digital Cupcake certainly does not encourage users to jailbreak their phones and merely provides information for those that need it. We will not be responsible for any consequences caused from the jailbreak, so proceed with caution.**

Ready to move on?

Here are the important things you need to know about the iOS 5.1 and jailbreaking:

  • 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.

Now that you’ve read that, we (or the iPhone Dev-Team) present to you the redsn0w 0.9.10b6.


redsn0w (Photo credit: Dekuwa)

  • This is a *tethered* 5.1 jailbreak for non-A5 devices.  You’ll need to use redsn0w to “Just Boot” your device every time it power cycles, otherwise jailbreak apps won’t work (neither will Safari).
  • If you use ultrasn0w for your carrier unlock, be sure to use a custom IPSW to get to 5.1 first!  Don’t ever restore to a stock Apple IPSW!  Use redsn0w’s “Custom IPSW” button to create a NO_BB_* version of the 5.1 IPSW and restore to that instead of the stock one.  (That option is available only to 3GS and iPhone4-GSM owners.)  ultrasn0w itself will be updated for 5.1 in the next few days (same baseband support, not 5.1’s baseband).
  • If you’re lucky enough to have an old-bootrom 3GS, this jailbreak is actually untethered (redsn0w will figure that part out automatically).
  • While we were at it, we added @pod2g’s steaks4uce exploit to support MC models of the iPod touch 2G (whose last firmware was 4.2.1).  So now redsn0w will auto-detect and jailbreak both MB and MC versions of that older device.
  • iBooks won’t work until a future update of redsn0w

Visit the Dev-Team Blog for the download link, all the way at the bottom.

Update 3/9/12 Here’s a video walkthrough of how to apply the jailbreak, courtesy of Redmond Pie.

Any guesses as to when we’d be seeing the untethered jailbreak for A5 devices?

via Dev-Team Blog

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