1. Download the tool ( here and here ) and install it .
2. Load iTunes and put your iDevice in DFU mode.
3. When iTunes will tell you that it find an iPhone in recovery mode, close iTunes and start iReb.
4. Simply select your device from the list and wait a few seconds until the screen turns white or red.
5. Start iTunes, select your iPhone and holding shift ( or alt on a Mac ) , click on restore.
6. Select the custom firmware and you are good to go.
You can also follow step bellow
Step 1 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 Step 4 Then hit Blue Arrow Button to proceed. Step 5 Step 6 ***For the 3.1 firmware you may have to increase the size of your root partition slightly for the IPSW build to be successful. 695MB worked just fine for me*** The Bootneuter settings are greyed out for the iPhone 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 Step 8 Step 9 If prompted enter your Administrator password and click the OK button. When prompted if your iPhone has been Pwned before, Click No. It allows for a more thorough restore. You will be asked to turn OFF the device. Make sure iPhone is connected to the USB port and turned off. Step 10 If you failed to follow the instructions, 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 you that it successfully entered DFU mode. iTunes will also pop-up. Step 11 Step 12 Step 13 That is it. Enjoy your jailbroken 3.1.3 Device.
Double click PwnageTool dmg file to mount it.
Select your device i.e: iPhone 3G. A big Green check mark will appear on the selected device.
Now hit the big Blue Arrow button at bottom right to proceed.
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: iPhone1,2_3.1_7C144_Restore.ipsw. A check mark will appear next to it.
On the next page you will have 6 choices. Select the General and hit Blue Arrow Button to proceed.
On the next Page you can decide your Root Partition Size where OS resides. Click activate the phone (if you’re on unofficial carrier).




Now you are ready to build your custom firmware. Click the build button to select it, then click the blue arrow button to proceed.
You will be asked to Save your custom .ipsw file. Save it to the same Pwnage folder.
PwnageTool will start building your custom firmware. Wait until it’s done.

Be ready to follow directions now.


In iTunes, hold the Alt/Option key and hit Restore.
From the popup window, browse to the Pwnage Folder and select you custom .ipsw file that you just created (iPhone1,2_3.1_7C144_Custom_Restore.ipsw) and click Open Button.
iTunes will now restore the firmware on your iPhone. This can also take up to 10 minutes.
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