This Guide is for both iPhone 3GS and iPhone 3G. All steps for both models are same. The only difference is that for 3GS you need IPSW file for 3GS and in case of 3G you need IPSW for 3G to create Custom IPSW from it. Both files are linked in the guide.

IMPORTANT

If you’re still on OS 3.0 or updated to OS 3.1 using PwnageTool which means you’ve preserved you Baseband which means, along with jailbreak, you can Unlock your iPhone using UltraSn0w. On the other hand;

If you bought an iPhone with 3.1.x preinstalled or you have updated your iPhone to OS 3.1.2, you will be able to Jailbreak your iPhone only.

Jailbreak iPhone 3GS, 3G 3.1.2

Update your iTunes to latest version and Backup your iPhone.

Create a folder on your desktop and name it: Pwnage. Then download the following files and put them into Pwnage folder:

• PwnageTool 3.1.4: Rapidshare or Official Torrent link
• for 3GS: iPhone2,1_3.1.2_7D11_Restore.ipsw
  or
• for 3G: iPhone1,2_3.1.2_7D11_Restore.ipsw

(Download through Firefox because Safari often auto extracts ipsw file) The iPhone OS 3.1.2 file is also available in All iPhone Firmwares post.

Jailbreak iPhone 3GS OS 3.1

Step 1
Double click PwnageTool_3.1.3 dmg file to mount it.

Click and drag the PwnageTool icon to Pwnage Folder you created and then open it from there.

Warning Box will Popup. Just hit the OK button.

Step 2
Make sure you select Expert Mode from Top menu

Step 3
Select your device. A big Green check mark will appear on the selected device.
Now hit the big Blue Arrow button at bottom right to proceed.

Step 4
On the next page, PwnageTool will automatically find the IPSW file. If not found then click “Browse for IPSW” button and select the downloaded IPSW file from the Pwnage folder. A check mark will appear next to it.

Then hit Blue Arrow Button to proceed.

Step 5
On the next page you will have 6 choices. Select the General and hit Blue Arrow Button to proceed.

Step 6
This is the most important step. Please read carefully about selecting activate the phone option. You will know you didn’t choose the right option if you don’t have signal after jailbreaking.

On the next Page you can decide your Root Partition Size where OS resides. Click activate the phone (only if you’re on unofficial carrier).

***Deselect Activate the phone option if you are on official carrier. For the 3.1.2 firmware you may have to increase the size of your root partition slightly for the IPSW build to be successful. may be 700MB.***

The Bootneuter settings are greyed out for the iPhone 3GS and 3G. Click the blue arrow button.

The next screen will show the Cydia settings menu. It allows you to create custom packages so you do not have to manually install them later.

Go to Download packages tab.and hit the Refresh button to display all the available packages. Double click your desired package, it will be downloaded and will be available under the Select Packages tab.

When you have downloaded your desired packages, go back to Select Packages tab and check mark the ones you want.

then hit the Blue Arrow Button to proceed.

Custom Packages Settings will displays listed package settings for your custom IPSW. Leave these settings as is for now. Just click the Blue Arrow Button to proceed.

On the next Custom Logos Settings menu, you’ll be able to add your own images as boot logos. Click the Browse button to select your Boot logo and Recovery logo. I just use defaults so deselected all options.

Click the blue arrow button to continue.

Step 7
Now you are  ready to build your custom firmware. Click the build button to select it, then click the blue arrow button to proceed.

Step 8
You will be asked to Save your custom .ipsw file. Save it to the same Pwnage folder.

Step 9
PwnageTool will start building your custom firmware. Wait until it’s done.

If prompted enter your Administrator password and click the OK button.

Step 10
When prompted if your iPhone has been Pwned before, Click No. It allows for a more thorough restore.

Step 11
You will be asked to turn OFF the device. Make sure it is connected to the USB port.

Step 12
NOTE: If you’re already jailbroken (by whatever means), you don’t need to mess around with DFU mode at all.  Just create (or get from a friend) your custom IPSW and Option-Restore (Shift-Restore on Windows) to it via iTunes.  Don’t enter DFU mode at all.  Please make sure you are restoring to the custom IPSW, not the stock one from Apple!  For best results, use the latest iTunes (9.0.1) — which includes a nice new application organizer.

If it’s the first time you’re jailbreaking your iPhone, Be ready to follow directions now to get into DFU Mode.

• You will be asked to hold the home button and the power button for 10 seconds.
• Then, you will have to release the power button and hold the home button for 10 seconds to enter DFU.

If you failed to follow the instruction, it will show you a message asking if you want to retry?. Click Yes.
Unplug the iPhone from the USB. Turn it OFF, then turn it back ON. Reconnect it to USB and turn OFF the iPhone when prompted.

When followed correctly, PwnageTool will display a message telling your that it successfully entered DFU mode. iTunes will also pop-up.

Step 13
In iTunes, hold the Alt/Option key and hit Restore.

Step 14
from the popup window, browse to the Pwnage Folder and select you custom .ipsw file that you just created and click Open Button.

Step 15
iTunes will now restore the firmware on your iPhone. This can also take up to 10 minutes.

When done. You have successfully Jailbreak iPhone 3GS/3G running iPhone OS 3.1.2.

Now in Order to Unlock your iPhone 3GS/3G OS 3.1.2 follow this old Guide which also works for OS 3.1.2 if you jailbreak iPhone using PwnageTool:

Unlock iPhone 3GS/3G with UltraSn0w

ATTENTION!!! iPhone 3GS and iPod Touch 3G users:

From Cydia and make sure you accept the option to store your ECID SHSH on Saurik’s server. It will put you on the safe side for future jailbreak. By doing this you’ll be able to downgrade to the firmware for which you saved your ECID SHSH on Saurik’s srver.

You can check for which firmware you have saved your ECID SHSH by looking at the top of the Cydia Home screen:

Have fun with iPhone OS 3.1.2 and don’t forget to Follow Us On Twitter.

Before you start with it here is what you’ll need in this guide.

1. iTunes 9
2. Pwnage Tool 3.1.4
3. Download Original iPhone OS 3.1.2 Firmware

How to Jailbreak iPhone 3G 3.1 Firmware:

1. Download and Install iTunes 9 from Apple site.
2. Make complete backup of your iPhone.
3. Download Original iPhone 3.1.2 Firmware using the links provided in this post.
4. Download Pwnage Tool 3.1.4 and select your device from devices list.
5. Now Pwnage tool will automatically detect original
   firmware file which you downloaded in Step 3, if it can’t then browse it manually.
6. Click Next and then Choose Yes and then on another dialogue box Choose no, if you aren’t using Contract iPhone. Choosing No will let you unlock your iPhone and use it with any SIM
7. Now Pwnage Tool 3.1.4 will start building custom IPSW file.
8. Once done, click Yes and then click Next.
9. Now Open iTunes 9 and choose your iPhone from the devices list on left side now press Alt/Option key and then click on Restore and browse the Custom made iPhone 3.1.2 firmware now choose Open.
10. Now relax back until iTunes updates your iPhone to 3.1.2 Firmware.

After completing the entire above steps your iPhone 3G 3.1.2

Dont Forget to follow me on twitter

GeoHot has Twitter that BlackRa1n still works on the new 3.1.2 firmware as he successfully jailbroke his iPhone 3GS running the latest OS 3.1.2.

This doesn’t mean that you should go ahead and update to OS 3.1.2. Read the Golden Rule:

Never update to any latest firmware if you’ve a jailbroken and/or unlocked iPhone.

GeoHot also notified that there will be delay in BlackRa1n release. We will keep you posted as there comes any update. Stay tuned.

This custom made 3.1 firmware comes with Apple logo and Cydia. So now follow the step below to jailbreak.

How to Jailbreak iPhone 3G Firmware 3.1

1. First Download the following links of
   custom iPhone 3.1
   Firmware
2. Now join all the downloaded parts using HJSplit and you will get one archive, uncompress that archive and it contains IPSW file of
   firmware 3.1 Custom iPhone 3G 3.1 Firmware Part 1
   Custom iPhone 3G 3.1 Firmware Part 2
   Custom iPhone 3G 3.1 Firmware Part 3
3. Now Install (if you haven’t already) and open
   iTunes 9
4. Connect you iPhone to the PC using data cable.
5. Choose your iPhone from devices menu on left.
6. Now click “Resotre” while holding Shift key and select the custom IPSW file which you downloaded in step 1
7. Now Sit back and relax until the installation process complete.
8. After Jailbreaking your iPhone 3G to 3.1 Firmware you can follow this guide to unlock you iPhone and use with any SIM/Carrier.

How to Jailbreak iPhone 2G Firmware 3.1

1. First Download the following links of
   custom iPhone 3.1
   Firmware
2. Now join all the downloaded parts using HJSplit and you will get one archive, uncompress that archive and it contains IPSW file of
   firmware 3.1 Custom iPhone 2G 3.1 Firmware Part 1
   Custom iPhone 2G 3.1 Firmware Part 2
   Custom iPhone 2G 3.1 Firmware Part 3
3. Now Install (if you haven’t already) and open
   iTunes 9
4. Connect you iPhone to the PC using
   data cable.
5. Choose your iPhone from devices menu on left.
6. Now click “Resotre” while holding Shift key and select the
   custom IPSW file which you downloaded in step 1
7. Now Sit back and relax until the installation process complete.

No ultrasn0w or Bootloaders needed for iPhone 2G.

Link Credits [Sizlopedia]