How to downgrade and jailbreak iPhone 3GS accidentally updated to 4.0 (New BOOTROM)

This is for people who accidently upgraded their Iphone 3GS New Bootrom to 4.0 and needs to unlock their phone for T-Mobile or jailbreak.
This is a different method than the one ih8sn0w has figured out. I have tested and tried this method on 3 Iphone 3GS New Bootroms so it's guaranteed to work. If you have any questions, please ask and I will help.

This will work for the Iphone 3GS New Bootroom on Version 4.0.

Steps.
1. You must have an Iphone 3GS New Bootroom on Version 4.0.
2. Must be done on Itunes 9.2.
3. Point Itunes hosts to saurik's server, you DO NOT NEED SHSH BLOBS.
4. Put Iphone in restore mode and restore to 3.1.3 firmware.
5. Error 1015 will occur, and the phone will still be in recovery mode.
6. Run Blackra1n and click make it rain, the phone will go into a black screen for about 20-25 minutes, after that the phone will boot up to the activation screen with version 3.1.3. Blackra1n doesnt jailbreak the phone, it only boots it up after the 1015 error.
7. Now, once you're at the activation screen, redsn0w will not work to hactivate so you will need to use an AT&T sim card to activate.
8. Run spirit to jailbreak the phone.
9. Unlock the phone with ultrasn0w 0.9.3.

I don't think anyone has figured this out yet. I figured it out on accident. And I've tested it on 3 Iphones 3GS with new bootrooms, I hope this helps many of you guys.

Thanks bro its a really good guide casue i have a 3Gs stuck on Emergency Screen and can't Jailbreak will try your guide and post results...
I don't understand clearly point 3 can you please be more explicit on it??? Please tell us how to point iTunes to Saurik's Servers.
And one more thing what OS are you using???


Br,
Tito Millo

Quote:

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Originally Posted by tito millo

Thanks bro its a really good guide casue i have a 3Gs stuck on Emergency Screen and can't Jailbreak will try your guide and post results...
I don't understand clearly point 3 can you please be more explicit on it??? Please tell us how to point iTunes to Saurik's Servers.
And one more thing what OS are you using???


Br,
Tito Millo

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I did it on 4.0. I downgraded to 3.1.3.
Step 3, You need to point your itunes's host to saurik's server. GOOGLE "how to point itunes to saurik's server"

First of all, thanks for this post! I bought a new 3gs last week and it was on 4.0 so I have no way of downgrading due to not having any blobs saved. I tried the method you describe, but it doesn't work for me. I get error 3194, but I proceed anyway and it doesn't work. The other thing is it could be due to not pointing to saurik's servers correctly. So, does the error make difference?

Ok i figure it out how to conect to Saurik's servers... but are you sure this will work with an iPhone w/o blobs????
Somehow i will try it later when i am at office and will let you know the results.

PS: What i was thinking is the 3 iPhone u downgraded already have had SH Blobs on sever, some one maybe did backup be4 u

Br,
Tito Millo

will give this a try tonight cant see it working after all these weeks of wait without shsh blobs though...

error 3194 not 1015. the 3 phones you tried must have blobs saved ?

appretiate you posting your ideas for the stuck people but think ur wrong mate.

Tried on my 3Gs and not working... i am sure those iPhone you restored have had the Blobs saved on Saurik's server, someone did it before you anyway thanks for trying to help

Br,
Tito Millo

Quote:

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Originally Posted by NammyRawrs

3. Point Itunes hosts to saurik's server, you DO NOT NEED SHSH BLOBS.

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You now need to have previously saved your SHSH blobs for 3.1.3 as Apple has stopped issuing them.

The way Saurik's server works is like this:

When you try and restore your iPhone in iTunes with your host file redirected to saurik's sever. If saurik's server does not have a copy of 3.1.3 SHSH blobs for your iPhone then saurik's server contacts an Apple server and asks for the 3.1.3 SHSH blobs from there. If valid SHSH blobs can be retrieved from Apple then they are saved in Saurik's server to allow restores to continue to work for your iPhone even if Apple stops signing that OS version.

A few days after 4.0 was officially released - Apple stopped issuing 3.1.3 SHSH blobs. There were plenty of warnings about backing up 3.1.3 blobs now it is too late (if you did not heed those warnings)

Nice post ...
but there is one problem ... number 7.

7. Now, once you're at the activation screen, redsn0w will not work to hactivate so you will need to use an AT&T sim card to activate.

How to obtain AT&T simcard outside of USA ( or any other country without contract with apple )

_DM_ iPhone 3GS 32 GB black stucked @ 3.1.3 5.12 bb new bootrom 6.4 :-)