April 25, 2024
iPhone Dev-Team Updates RedSn0w to Enable Downgrade of the iPhone 4S, iPad 2/3

iPhone Dev-Team Updates RedSn0w to Enable Downgrade of the iPhone 4S, iPad 2/3

Posted May 11, 2012 at 1:56pm by iClarified
The iPhone Dev-Team has released a new version of RedSn0w that can downgrade the iPhone 4S and iPad 2/3 for those with saved SHSH blobs.

Starting with redsn0w version 0.9.11b1, those with newer devices (iPad2, iPad3, and iPhone4S) can join the downgrade fun too! In a radical departure from previous versions of redsn0w, it now directly supports restoring IPSWs to your device. The first use of this new feature implements a hack that allows A5 downgrades without a bootrom-level exploit.

Some important points:
● The new feature is at Extras->Even More->Restore
● You cannot downgrade without the personalized SHSH blobs for your device at that lower firmware. You need to have fetched those blobs while the signing window was open, using either Cydia's built-in TSS@Home feature, or with TinyUmbrella. The new Restore screen of redsn0w lets you choose either the remote blobs or local ones (for the earlier firmware). If you don't know where TinyUmbrella put your blobs, TinyUmbrella has a button that will show you (copy them out of that folder and feed them to redsn0w).
● he A5 downgrade method actually updates to the latest firmware before downgrading to the earlier one. This process updates your baseband to whatever is newest. DO NOT USE THIS METHOD IF YOU RELY ON UNOFFICIAL UNLOCKS of your iPhone4S. Those who used the temporary SAM technique to unlock their iPhones to specific SIMs shouldn't be affected by this baseband update.
● This method can be fixed by Apple with a firmware update. It's a (pleasant) mystery why they haven't fixed it yet, because reverse-engineering of the restore ramdisk indicates they do know about it. It's possibly too niche to bother to fix right now.
● The least-tested devices with this method are the iPad2,3 and iPad3,2 (because we don't have those models). If you do and you feel like experimenting, please let us know how it turns out in the comment section below!
● This update involves a bunch of new redsn0w code. We recommend sticking to the previous version 0.9.10b8b unless you're specifically using this new feature, until all the bugs are worked out! (Note: If redsn0w gets stuck at the "Waiting for device" stage for more than 30 seconds, you've hit a pesky GUI bug... that will be fixed in an upcoming version!)

You can download the latest version of RedSn0w from here. We will be posting a tutorial on how to perform the downgrade shortly!

You can follow iClarified on Twitter, Facebook, or RSS to be notified of any updates.

There is a bug that makes downgrading the iPhone 4S to iOS 5.0.1 build 9A406 not work. Select SHSH blobs for 9A405 instead.

iPhone Dev-Team Updates RedSn0w to Enable Downgrade of the iPhone 4S, iPad 2/3

iPhone Dev-Team Updates RedSn0w to Enable Downgrade of the iPhone 4S, iPad 2/3
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Comments (7)
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Kaco - December 15, 2012 at 11:22pm
how can i downgrade my iphone 4s runing ios 6.0.1 to ios 5.1.1?
yoda915 - May 11, 2012 at 7:23pm
Great Work DEV-TEAM This works on the ipad 2 gsm version (yes you have to already have your shsh blobs saved as it wont work without them). I have just tried this without a problem. settings now show version 5.0.1 (9A405) which has now made possible to jailbreak...
Manuel - May 11, 2012 at 5:47pm
Can you provide a link for a download to the shsh blobs needed! I sortha updated my iphone by mistake. =(
mmc - May 11, 2012 at 5:22pm
Does this downgrade baseband for 4S for someone that accidentally updated to 5.1.
Jadett_babe - May 11, 2012 at 4:38pm
How should I downgrade my new iPad using this? Please explain.
jack - May 11, 2012 at 2:48pm
how can you downgrade ipad 3 when you dont have shsh ever?
Duh - May 12, 2012 at 4:18pm
You can't. For iPad 3 if you were on 5.1 u needed tinyumbrella to save blobs
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