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iPhone 3GS users will be knowing that it’s not possible to jailbreak iOS 4.0 on iPhone 3GS with any existing jailbreak tools like Pwnagetool 4.0.1 or Sn0wbreeze 1.6.2 since both the tools are only meant for iPhone 3GS with old bootrom.

But now you don’t have to disappoint if you have iPhone 3GS with new bootrom since iH8sn0w has come up with guide to jailbreak iOS 4.0 on iPhone 3GS new bootrom though procedure is quite lengthy & has most important requirement of saved SHSH blobs of 3.1.2 firmware for your iPhone 3GS.

Just follow complete step by step guide to jailbreak iPhone 3GS with New bootrom:

STEP 1 : 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. — http://saurik.com/id/12

II : If you have it saved with TinyUmbrella, then download the GUI here. — http://thefirmwareumbrella.blogspot.com/
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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 2 : Creating custom 4.0 firmware.

I : Download sn0wbreeze from http://ih8sn0w.com and create your custom 4.0 ipsw.

*Ignore the warnings after browsing for the ipsw.*
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STEP 3 : 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 4 : Pwning iBSS + iBoot

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

**SAVE THE PAYLOADS WHERE iBooty is.**
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STEP 5: 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. ====== ------- STEP 6: 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 7 : Booting

I : Just Re-Run iBooty and select “Boot It”. If all goes well it will boot!
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You could always get support from UnlockAlliPhone.com about any Unlock & JailBreak issue of any model of iPhone including iPhone 2G,3G & 3GS and also upcoming iPhone 4. They provide Premium Members Support for life time. Means just pay one time a small fee and you will receive support(real human support – avg response time 2 hour) for all present & future version of iPhone.

Thaks to blogsdna , openpwn