How To Jailbreak iOS 4 For iPhone 3GS (New Bootrom) Users With SHSH Blobs (Mac)

Jailbreak iOS 4 on iPhone 3GS

iH8sn0w, developer of popular jailbreaking tools such as Sn0wbreeze has just published a detailed guide on how to jailbreak iOS 4 for iPhone 3GS with new bootrom for Mac users.

Windows users can checkout this guide to jailbreak iOS 4 for iPhone 3GS (new bootrom) with SHSH blobs (ECID files).

Some important points before we proceed:

If you gone through all the points mentioned above and meet the requirements then you can follow the step-by-step instructions given below:

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 Pwanage 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.

As always, please don't forget to drop us a line to tell us how it goes.

[courtesy iH8sn0w]

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