Redsn0w 0.9.11b4 Released Downgrade Ip4[S] & iPad2/3
5x redux
What’s old is new again!
Jailbreakers with devices that pre-date the iPad2 will always be able to downgrade (with SHSH blobs) to previous firmware versions due to geohot’s limera1n exploit, which allows us to bypass the restrictions that Apple places on restores. But until now, that ability has been limited to those older devices (if you have an older device and don’t know how to do that, check the popular tutorial sites or ask in the comments below).
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:
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).
The 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!)
Of course all eyes are on @pod2g for his upcoming 5.1 untethered jailbreak. Watch his blog or twitter feed for the latest updates about that, but in the meantime if you accidentally updated your jailbroken A5 device to something later than 5.0.1, feel free to try this new A5 firmware downgrade feature of redsn0w!
Update #1: We accidentally left out one of the two flavors (“9A406”) of 5.0.1 for iPhone4S. It’ll be in the next update, but in the meantime check if Cydia or TU saved your blobs for the other 5.0.1 for iPhone4S (“9A405”). Version 0.9.11b2 adds support for that second “9A406” flavor of 5.0.1 for the iPhone4S
Update #2: Version 0.9.11b3 should fix the spurious “Restore failed” messages people were sometimes getting, and it behaves better with nearby devices that have wifi syncing enabled!
Update #3: Version 0.9.11b4 completes the support for 5.1.1 on A4 devices and earlier, including proper “Stitching” and “Custom” creation of NO_BB IPSWs.
Kill ME,I'm Using iPhone Without Jailbreak
What I'm using it? You can request me Factory unlock for 3,Denmark | 3 & Voda,Australia | Telenor,Norway | AT&T,America 4,4[s],5 | SFR,France 4,4[s]
Note: Factory unlock service is paid.
Last edited by Sitlay; 05-16-2012 at 08:35 AM.
The Following 230 Users Say Thank You to Sitlay For This Useful Post:
i think this version of redsn0w is dangerous for 4S....
Yeah sure this will be Dangerous for ip4[s]
Quote:
Originally Posted by cooldayr
What are you talking about
The version is designed with the iPhone 4S in mind
He is asking this version is Dangerous for ip4[s] cause this version is especially for ip4[s] which will make Apple to Think Different
Kill ME,I'm Using iPhone Without Jailbreak
What I'm using it? You can request me Factory unlock for 3,Denmark | 3 & Voda,Australia | Telenor,Norway | AT&T,America 4,4[s],5 | SFR,France 4,4[s]
Note: Factory unlock service is paid.
The Following 2 Users Say Thank You to Sitlay For This Useful Post:
What are you talking about
The version is designed with the iPhone 4S in mind
The 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.
"Because we believe that our ethnic group, our society, our political party, our God, is better than your God, we kill each other." -- Neale Donald Walsch
