by Apple, Iphone

Jailbreak iPhone 3GS (New BootRom) iOS 4.0 Firmware

Sn0wbreeze Jailbreak iOS4

The iH8Sn0w has posted detailed instructions on how to jailbreak iPhone 3GS new bootrom running iOS 4 with Sn0wBreeze 1.6.2. Yes! using this method you can jailbreak iOS 4 on iPhone 3GS new bootrom. But there are few things to note first.

So, in following you can find the tools required for jailbreak iOS 4 on iPhone 3GS new bootrom and complete step by step instructions of the process.

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.
——-
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. — http://saurik.com/id/12

II : If you have it saved with TinyUmbrella, then download the GUI here. — http://thefirmwareumbrella.blogspot.com/
——-
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.
——-
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.
——
STEP B : 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.*
——
STEP C : Installing LibUSB for iRecovery

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

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

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

*********
If you are a 64-Bit user, follow this tutorial — LibUSB 64-Bit Tut
*********

Once LibUSB is installed iRecovery should be able to function now.
——-
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.**
——-
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”
======
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 F: Restoring to 4.0 + Booting
——-
*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!]***
——-
STEP G : Booting

I : Just Re-Run iBooty and select “Boot It”. If all goes well it will boot!

Enjoy, the process is completed.

——-

Note: As a precautionary measure backup your phone before starting jailbreak process.


via iPhoneHeat
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