jailbreak 3GS new bootrom using snowbreeze update....

this is an update of my previous post here.

Now using sn0wbreeze 1.7 from ih8sn0w.

full details below as given by ih8sn0w...

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THIS TUTORIAL ASSUMES YOU ARE ALREADY ON 3.1.2!
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WHAT YOU WILL NEED:

* An iPhone 3G[S] -- new bootrom
* 3.1.2 already installed or 3.1.2 installed via SHSH blobs. <-- Broken blackra1n'd devices will work. (Especially if Spirit messed you up!).
* Payload Pwner-r3 for the 3GS.
* sn0wbreeze V1.7
* iBooty V1.3
* LibUSB (64-Bit users read carefully!!!)
* 3.1.2/4.0 3GS firmware downloaded.
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*NOTE : IF YOU HAVE THE SLEEP ISSUE, YOU WILL NEED TO RESTORE BACK TO 3.1.2 FIRST.*

STEP A : 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 B : Pwning iBEC + iBoot

I : Download this easy tool here -- Payload Pwner-r3 for 3GS // It will help you create the payload + iBEC.

**SAVE THE PAYLOAD + iBEC WHERE iBooty is.**
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STEP C : Making a Custom IPSW

I : Download sn0wbreeze V1.7 from here -- sn0wbreeze V1.7

II : USE EXPERT MODE!

III : In General, Checkmark "Disable NOR Flash" <-- THIS IS ESSENTIAL!!!!

IV : Build it. It will be on your Desktop.

**CUSTOM BOOT LOGOS THAT ARE MADE IN sn0wbreeze WILL NOT WORK ON NEW BOOTROMS!**

*Mac Users : PwnageTool does not have this option. I don't think it will ever be in there. Use a Windows Virtual Machine or friends PC to create your firmware.*
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STEP D: 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 V1.3 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.
Aswell as DeviceTree from the folder "Firmware\all_flash\all_flash.n88ap.production\DeviceTree.n88ap"

IV :
* Rename your Kernel 4.0-Custom to "kernel.40"
* Rename your iBEC 4.0-Custom to "ibec.40"
* Rename your DeviceTree 4.0-Custom to "devtree.40"
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Your folder should look like this :

- iboot.payload <-- Created with Payload Pwner.
- devtree.40 <-- Grabbed from Custom IPSW made by sn0wbreeze.
- ibec.40 <-- Created with Payload Pwner.
- irecovery.exe <-- Comes with iBooty.
- readline5.dll <-- Comes with iBooty.
- iBooty.exe <-- Comes with iBooty.
- kernel.40 <-- Grab from Custom IPSW made by sn0wbreeze.
- sn0w.img3 <-- Comes with iBooty.
- wait.img3 <-- Comes with iBooty.
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STEP E: 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 the image, you can proceed!

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

***WHEN DONE, YOUR DEVICE WILL GO INTO RECOVERY MODE. IT WONT BOOT.***
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STEP F : 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 testing everything!)
* posixninja (For his continuous help!!!)


credits to

iH8sn0w
Developer of iREB/sn0wbreeze


original source..