Update : iBooty has been updated to v1.6 ! Added a video tutorial. 

iH8sn0w has posted a process quite complex to jailbreak iOS 4 for iPhone 3GS with new iBoot.
This jailbreak based on the creation of a custom firmware using Sn0wbreeze, that you will install thanks to a new tool iBooty from iH8sn0w.

It is a TETHERED JAILBREAK = whenever you turn off your phone, you will need to re-connect it to a computer to be able to turn it back on

iPhone 3GS, find the version of your iBoot.
For old iBoot, follow this guide.
For iPhone 3GS with new iBoot, this tutorial concerns you !
Required :

Warning Note: All the standard warnings apply. This is for advanced users only. Only proceed if you think you know your iPhone inside out.


iOS 3.1.2, 4.0
iOS 3.1.2 SHSH blobs
=>> Download this

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.  
II : If you have it saved with TinyUmbrella, then download the GUI here.   
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.

STEP 2: Creating your custom firmware 
Use Pwnage Tool to create a custom ipsw ignore the warnings about the new bootrom. 

Extract the zip file we downloaded earlier and use terminal to enter it
Create a new folder inside this called 3.1.2 and extract your 3.1.2 ipsw here (unzip *.ipsw in terminal)
Use xpwntool to patch iBoot & iBSS (run this in terminal)
xpwntool Firmware/dfu/iBSS.n88ap.RELEASE.dfu ibss.d -iv 41639d34547ae3dd7921bf3539dba529 -k 9121de4a038675d92e1a28683b2138b7a3bdb80994273d090398051c7f5af53c; bspatch ibss.d ../exploitibss312 ../ibss.patch; xpwntool Firmware/all_flash/all_flash.n88ap.production/iBoot.n88ap.RELEASE.img3 iboot.d -iv 127aa60e77da219961ee70707f44cbd4 -k c72ab4aae971f3a9ec356dfe555e4aef72d8e96c480698445ac236904e6a3443; bspatch iboot.d ../iboot.payload ../iboot.patch; cd ..; rm -rf 3.1.2
Create a folder called 4.0_cust inside 4.0_pwn and enter it with terminal and copy your custom 4.0 ipsw here.
Extract your custom ipsw (unzip *.zip)
Run the following in terminal:
cp kernelcache.release.n88 ../kcache.40; cp Firmware/dfu/iBEC.n88ap.RELEASE.dfu ../iBEC.40; cd ..;
Copy your signed iBSS from earlier into 4.0_pwn
STEP 10:
Place your device in DFU mode (power home for 10 seconds, release power keep holding home (blank screen and itunes asking to restore).
STEP 11:
Run the following in terminal:
./irecovery -u ibss312.dfu; ./irecovery -r; sleep 10; ./irecovery -e exploitibss312; ./irecovery -u iBEC.40; ./irecovery -c go; sleep 10; ./irecovery -u sn0w.img3; ./irecovery -c "setpicture 0"; ./irecovery -c "bgcolor 1 1 1";
STEP 12:
Restore your custom 4.0 ipsw
Booting your device:
Run the following in terminal (once in the 4.0_pwn directory):
./irecovery -u ibss312.dfu; ./irecovery -r; sleep 10; ./irecovery -e exploitibss312; ./irecovery -u iBEC.40; ./irecovery -c go; sleep 10; ./irecovery -u sn0w.img3; ./irecovery -c "setpicture 0"; ./irecovery -c "bgcolor 1 1 1"; ./irecovery -u kcache.40; ./irecovery -c bootx;
iTunes will detect your device several times before it boots.
PS: When i wake up i will write a script to automate most of this.
Once you have jailbroken your phone, you can unlock it using ultrasn0w 0.93 (on any baseband), guide for which is posted here.

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