How to Jailbreak Your iPhone 3GS on OS 3.1.2 Using RedSn0w (Windows)

[kracken]

This tutorial can be used to jailbreak before applying the BlackSn0w unlock

Step One
Create a folder on your desktop called Pwnage

Download RedSn0w from here and place it in the Pwnage folder.
Likewise, download the latest 3.1.2 firmware from below and
place it in the same folder.

3.1.2 (3GS): iPhone2,1_3.1.2_7D11_Restore.ipsw

Extract the RedSn0w executable from the zip file to the Pwnage folder.

Step Two
Connect your iPhone to the computer and launch iTunes.

Select your iPhone from the list of devices on the left. Now hold down
shift and click the Restore button. Restore is preferred
as it won't create any wasted space on your iPhone.

Navigate to the Pwnage folder on your desktop and select the firmware ipsw.
Click the Open button to continue.

Step Three
Once iTunes has finished updating your iPhone to the desired
firmware you may launch redsnw0w.exe from the
Pwnage folder on your desktop.

Step Four
Once RedSn0w opens click the Browse button

Step Five
Select the firmware ipsw we placed in the Pwnage folder on our desktop then click Open

Step Six
RedSn0w will ask you if this is a newer (fixed) model iPhone.
Newer models of the iPhone 3GS have a fixed bootrom which
requires you to connect your device to the computer
each time you wish to reboot.

To find your serial number you can follow these instructions.
The week number is usually the 4th and 5th digit of the serial
number. For example, a serial number beginning with 88926
would be week 26 of 2009. 3GS units made week 45 or later will
usually have a fixed bootroom. Before week 40 they usually have
the older bootroom. Between weeks 40 and 45 the results vary.

If you believe your device has a fixed bootrom then press the Yes button.
Otherwise press the No button.

If you accidentally select the wrong option you may have to do
a full restore so please make this choice carefully.

Once the firmware has been verified click the Next button to continue.

Step Seven
Make sure Cydia is selected and click the Next button.
From this window you can select the jailbreak options you
would like. If you have already pwned your device check
the Already pwned option.

Verbose boot displays detailed information on boot of your device
and is generally only needed by developers and advanced users.

Make sure Cydia is selected. For this tutorial we will also select
Custom boot logo and Custom recovery logo.

When you click to select each custom logo option a dialog window
will appear asking you to select the image. Locate the image
you would like to use then press the Open button.

*Remember the rules for boot logos are: RGB or Grayscale format
with Alpha channel and dimension below 320x480.
Click the Next button to continue

Step Eight
RedSn0w will now instruct you on how to put your iPhone into
recovery mode. Disconnect you iPhone 3GS from the computer
then power it off. Then hold down the Home button while reconnecting
the device to the computer. Don't let go of the button until RedSn0w
detects the iPhone and begins installation.

Step Nine
Your iPhone will now reboot

Step Ten
RedSn0w will then begin uploading the new RAM Disk and kernel.

Step Eleven
Once this is complete you will be notified that RedSn0w is done.
Click the Finish button. When your iPhone finishes rebooting
(5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.

*As usual a big thanks to the iPhone Dev-Team for this contribution to the community.

[biffo1]

thanks mate the only thing stopping my messing with this is its still theathered , having been checking for updates , wont be long , great tut though mate cheers

[Clubber Lang]

Does this stop new 3GS phones going into restore mode on reboot?

[toonarmynufc]

does it do the 3g iphone aswell

[kracken]

does it do the 3g iphone aswell

HERE is the tutorial for 3G iPhone

[maltloaf]

Ive just used redsn0w to set my iphone to do a verbose boot (it's like a unix system booting up - i love it!) and set custom logos. It didnt alter anything else on the phone.

To do this, deselect "install cydia" and select "already pwned" and it wont alter your phone at all