Jailbreak iOS 5.1 on iPhone 4, 3GS, iPad and iPod Touch using Redsn0w 0.9.10b6

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iOS 5.1 has been released today by Apple and it has been jailbroken already via Redsn0w 0.9.10b6. The new version of iOS comes with new version of baseband (04.12.00) which is not unlockable. The new jailbreak is tethered for non-A5 devices, which means that you’ll have to connect the device to computer if you want to reboot it. There are some exception on dev team blogs which are listed below:

  • 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.

Warnings:

  1. This is tethered jailbreak for non-A5 devices
  2. If you use ultrasn0w for unlock, make sure you use custom IPSW option in extras section of redsn0w
  3. Ultrasn0w is still not updated to support 5.1. So that means you’ll loose unlock for now even if you preserve your baseband. The new ultrasn0w to support iOS 5.1 (and not new basebands) will be out soon though
  4. It is untethered for old bootrom iPhone 3GS
  5. iBooks won’t work

Here is the step by step guide to Jailbreak iOS 5.1 on iPhone 4, 3GS, iPad and iPod Touch using Redsn0w 0.9.10b6:

Warning: This would upgrade your baseband!!!

  1. Download Redsn0w 0.9.10b6 for Mac or Windows
  2. Connect your iPhone and open redsn0w
  3. Open extras > Select IPSW and Select IPSW. Point it to iOS 5.1 IPSW
  4. Click Back > Jailbreak
  5. Select install Cydia and any other option and click Next
  6. Switch off your iPhone  and click next
  7. Follow onscreen instructions to put your device in DFU mode
  8. Wait until your iOS 5.1 powered device is fully jailbroken

Remember- This updates your baseband. If you want to preserve baseband, open redsn0w, goto Extras and create custom IPSW. And then restore it with iTunes. Also, ultrasn0w isn’t yet compatible with iOS 5.1

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