Downgrading Trick?

[Vendettx#IM]

so my friend got a new iphone and wanted to downgrade and he came to me for help and i told him he cant without shsh.

so he didnt listen. downloaded 3.1.3 and than installed it using via itunes. it gave him an error of corse but than he said he just used tiny umbrella to boot it out of restore mode and boom. 3.1.3

said he has done it 3 times now.. i dont understand..

is this possible?

 

[myzhi]

What Iphone does your friend have?

If 2G / 3G, don't have to worry about SHSH. Upgrade and downgrade pretty easily.

If 3GS, is brand new or used? If used, there's chance previous owner saved his SHSH hashes on Cydia. If brand new, there's a tiny small chance Cydia has the hashes saved. Saurik, Cydia guy, says there are more shsh are on file and even some of them haven't ever JB and just got a new iphone may actually have an shsh on file.

Going to assume it's not Iphone 4 since 4.0 is first firmware for them.

 

[speedy2056]

You don't need the shsh blobs now!

Here's the site that tells you how to do it....steps only take around 10 mins!

I've done it and was on 4.0.2 with my 3gs and I successfully rolled back to 4.0.1 and am jailbroken again after upgrading the firmware by accident.

hxxp://xxx.pmptoday.com/2010/08/30/downgrade-iphone-4-from-ios-402-to-401-sans-shsh-blobs-to-jailbreak/

Replace the x with t's and w's.

 

[theringer]

You don't need the shsh blobs now!

Here's the site that tells you how to do it....steps only take around 10 mins!

I've done it and was on 4.0.2 with my 3gs and I successfully rolled back to 4.0.1 and am jailbroken again after upgrading the firmware by accident.

hxxp://xxx.pmptoday.com/2010/08/30/downgrade-iphone-4-from-ios-402-to-401-sans-shsh-blobs-to-jailbreak/

Replace the x with t's and w's.

Gonna post garbage in every thread speedy?

Did you miss the important parts or just decide not to mention?

There is much discussion on many blogs about a potential means of downgrading iOS 4.0.2 to 4.0.1 by simply changing a couple values in the buildmanifest.plist and copying all of the images from 4.0.1 into 4.0.2 and then deleting the files ending with 002. Following all of this, perform a DFU restore and somehow you will be on 4.0.1.
There is a perfectly logical explanation for all of this and I will lay out exactly what is happening and explain why it is working for the folks that are the lucky ones.
Let me get this out first.

1. This is not a miracle, at least not in the sense you all hope for
2. SHSHs are STILL required for any iPhone 4, iPhone 3GS, iPad, iPod Touch 3G, and iPod Touch 2G (MC Model)
3. There is NO way around this? unfortunately this method included.

Let me start by explaining something very important. The buildmanifest is used by iTunes to build much of the TSS request that is used to obtain your SHSH for any given firmware revision. Unfortunately, the BuildNumber has no part to play in the request for SHSH. All that you ended up doing in following these directions is request 4.0.1 SHSH blobs.THAT IS ALL. Since every single one of you that got this to work changed your hosts file to point to Cydia, Cydia responded to the TSS request with an SHSH blob that was ALREADY "on-file". There was no magic. There was no miracle, apart from the lucky break that your device had been put on Cydia?s SHSH request list at some time in the distant past.
That?s it in a nutshell folks. There was no amazing technique for bypassing Apple?s TSS. There was no amazing exploit that exists in DFU mode allowing for 4.0.2 -> 4.0.1 downgrading. It?s simple; Cydia had your SHSH because at sometime in the past either:

* Someone saved your SHSH with that device using TinyUmbrella and the default options
* Someone restored that device with Cydia in the hosts pointing to gs.apple.com
* Someone jailbroke the device and pressed ?Make my life easier?

So yes, unfortunately, the wait continues..