Pwning 4.0 on New Bootrom 3G[S] w/3.1.2 SHSH Blobs

[dr.deathx]

wrote this all on the road with my iPad, so sorry if there is any major Grammar errors. If anyone points out any errors, I'll fix it up. Anyways...
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I figured making a tool would take a bit too long. So, i'm going to write up this tutorial. It isn't recommended for regular users.

**BEFORE PROCEEDING, ENSURE THAT YOU HAVE YOUR PHONE BACKED UP!**
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WHAT YOU WILL NEED:

* An iPhone 3G[S] -- new bootrom
* 3.1.2 SHSH blobs.
* difrnt's iBSS grabber
* Payload Pwner-r2 for the 3GS.
* sn0wbreeze V1.6.2
* iBooty
* LibUSB (64-Bit users read carefully!!!)
* 3.1.2/4.0 3GS firmware downloaded.
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STEP A : Grabbing your 3.1.2 iBSS file.

Pointing your hosts :

I : If you have your shsh blobs saved on Cydia/Saurik's server then follow this tutorial. -- Caching Apple's Signature Server - Jay Freeman (saurik)

II : If you have it saved with TinyUmbrella, then download the GUI here. -- The Firmware Umbrella
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Restoring to grab the iBSS file.

I : Place your device in DFU.

II : Start up the iBSS/iBEC grabber.

III : Put the save folder on a new folder on your desktop.

IV : Hit "Start Monitoring".

V : Now go back to iTunes and do SHIFT + Restore. Then browse for your 3.1.2 IPSW. You will need to restore
to 3.1.2 in order to pwn 4.0.
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Saving your iBSS

I : After Restoring, Go to the folder that you have specified to save your iBSS file.

II : You will see folders like (Per**.tmp). Go into one of them, and you'll see a folder called "Firmware". Go there. Then go to the folder "dfu".

III : Copy the iBSS file to a safe place, then you can remove the folder created by the iBSS Grabber.
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STEP B : Creating custom 4.0 firmware.

I : Download sn0wbreeze from iH8sn0w.com | Jailbreak your iPod touches and iPhones and create your custom 4.0 ipsw.

*Ignore the warnings after browsing for the ipsw.*
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STEP C : Installing LibUSB for iRecovery

Run this mini tool to detect your O/S + Arch. -- Windows + Arch. Detector

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WARNING : IF LIBUSB IS NOT INSTALLED PROPERLY, YOUR USB MIGHT NO LONGER WORK!
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Windows XP Users download this installer -- LibUSB Installer
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Windows Vista/7 users RUNNING 32-Bit:

* Download the installer and run it in compatibility mode for Windows XP.

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If you are a 64-Bit user, follow this tutorial -- LibUSB 64-Bit Tut
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Once LibUSB is installed iRecovery should be able to function now.
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STEP D : Pwning iBSS + iBoot

I : Download this easy tool here -- Payload Pwner-r2 for 3GS // It will help you create the payloads.

**SAVE THE PAYLOADS WHERE iBooty is.**
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STEP E: iBooty Prep.

Most of you know of the utility "iBooty" that I made for Aki_nG.

It will work as long as you place all of the correct files there.

I : Download iBooty GUI here -- iBooty for 3GS and Extract it.

II : Extract your Custom IPSW created by sn0wbreeze with 7-Zip or another un-archiver.

III : Grab the kernelcache and bring it into the same folder as ibooty.
Also grab the iBEC from the folder "Firmware\dfu\iBEC.n88ap.RELEASE.dfu"

IV :
* Rename your iBSS 3.1.2 signed to "ibss312.dfu"
* Rename your Kernel 4.0-Custom to "kernel.40"
* Rename your iBEC 4.0-Custom to "ibec40.dfu"
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Your folder should look like this :

- iboot.payload <-- Created with Payload Pwner.
- exploitibss312 <-- Created with Payload Pwner.
- ibec40.dfu <-- Grabbed from Custom IPSW made by sn0wbreeze.
- irecovery.exe <-- Comes with iBooty.
- readline5.dll <-- Comes with iBooty.
- iBooty.exe <-- Comes with iBooty.
- ibss312.dfu <-- THIS NEEDS TO BE YOUR iBSS from the restore!
- kernel.40 <-- Grab from Custom IPSW made by sn0wbreeze.
- sn0w.img3 <-- Comes with iBooty.
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STEP F: Restoring to 4.0 + Booting
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*MAKE SURE YOU ARE ON 3.1.2 WHEN DOING THIS*

I : Run iBooty and Select "Prepare Device for Custom Firmware". Run the Process and if you see a snow flake, you can proceed!

II : Now open iTunes and restore to the custom ipsw.

***WHEN DONE, YOUR DEVICE WILL HAVE A BLACK SCREEN AND NOT BOOT! ITS IN A DFU LOOP [THIS IS NORMAL!]***
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STEP G : Booting

I : Just Re-Run iBooty and select "Boot It". If all goes well it will boot!
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Enjoy!
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Hopefully I can get a tool out there that will make all of this much easier. Of course, that only happens when I get bored from ppl msging me on Twitter =p
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CREDITS:
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* iPhone Dev-Team (Borrowed the iBoot payload from them =])
* msft.Guy (Helping out here and there.)
* AKi_nG (For being the first to test this)
* difrnt (For iBSS Grabber)
* posixninja (For his continuous help!!!)

B.R
Dr.DeathX

[Vichka Kham]

can you viewer by video?

[citifone]

this long procedure is no use if you need to unlock the phone with 4.0 firmware because many phones don't have shsh on file with cydia. now if you have shsh on file then you might as well downgrade to 3.1.3 then unlock. it would be alot easier and you can still install many apps..most apps don't work with 4.0