How can I down grade from 4.0.2

[Deadline333]

I want to jail break my phone but idk how to down grade it ???

[cncrim]

First, what kind phone do you have.

[Deadline333]

IPhone 3gs

[Simon]

Are you on official carrier?

[Deadline333]

Ya

At&t

[Simon]

Then just update to 4.2.1 and use greenpoison to jailbreak.

[loolioxp]

how the **** do u downgrade

[iYeow]

how the **** do u downgrade

I know your frustration, do not swear here . This is just a warning.

[cncrim]

First you need to have shsh blob of the firmware you want to downgrade to, edit your host file, open itunes shift restore........ ola.

[Techyrock]

Google downgrading 4.0.2 to 4.0.1 and you will get alot of results last time I saw a page but i dont remember URL but if u google that you will get it and it helps downgrading without shsh blobs

[Techyrock]

There you go

http://www.redmondpie.com/downgrade-...s-saved-guide/

[Simon]

That method doesnt work. You cannot downgrade without SHSH.

[Techyrock]

I did downgraded my 4.2.1 to 4.1 without shsh,what would you say about it?,and not even by that method much easier way

[Simon]

I would say you actually have SHSH and just didnt know it. The only way to downgrade without SHSH is to enter pwned DFU and restore to a lower firmware with tiny umbrella running. The side effect of doing this is that you are left in DFU after the restore and have to boot tethered to boot up. Every reboot (and even every time the device goes to sleep) will put you back in that dfu since the boot up process checks for those SHSH every time.

[Techyrock]

Well dude you are wrong ,I didn't had shsh I tried it before many times and it didn't worked because I didn't had tiny umbrella then I tried putting my phone to pwned Dfu mode and it worked and you are right about getting stuck in recovery mode the next step after it is getting shsh of phone since you are having 4.1 after getting shsh ,restore your phone using shsh method and now I am using phone normal and it's working great have some research before arguing well I am about to post it's method here

[Simon]

Not wrong. Done tons of research. Know all about SHSH and the requirements needed for downgrading. You might want to do a little research on the person you are talking to before saying something like that. You are obviously a bit confused.

Tell me what your ecid is and I can clear this up one time.

[i.Annie]

You have SHSHs you just wasn't aware of it. Whether you remember saving it or not, theyre there. I've had plenty of devices done that without SHSHs have failed to downgrade. This includes iPhones and iPods. There are plenty of people who have had success with having SHSHs and they didnt even know it.

Some people who don't know what SHSHs are have them, they check with TU and they're there.

No offense, but your device isn't special and can downgrade without SHSHs. They are saved.

[Techyrock]

Well Thanx for compliments I know well that whether my shsh were saved or not I did checked them on Cydia and tiny umbrella as well even if those two were wrong I tried downgrading shsh method but it never worked because i didn't had any,before comments try it and then maybe you will get sure I did it that's why I said,and for Ur info I didn't downgraded it using shsh method I downgraded using redsnow to shifting to pwned Dfu mode then I downgraded it and then phone wa stucked in Dfu mode due exploits and then I saved shsh blobs because phone was on 4.1 and then I restored it using shsh method to get rid of recovery mode,it's not about my device or me being special ,it's about research ,try things before opposing people and I can bet you 100% it works without shsh got it!

[i.Annie]

Like I said, been there, done that, didn't happen. Multiple devices, I don't just try one. Id suggest you do it all over again on a different device then you can call it solid proof.

[Simon]

Um, huh? That was very incoherent.
It sounds like you are saying you used pwned dfu to get to 4.1. Then you were able to save your 4.1 SHSH. If you knew anything about SHSH however you would know that they dont have anything to do with what firmware is on the device. You can only save SHSH for a firmware when Apple is still signing that particular firmware.