The following instructions will show how you can unlock and jailbreak the iPhone 2G on the 3.0.x iPhone firmware using RedSn0w. Before starting, please note that this guide will only work if you are going to use a Mac computer. Also, make sure you have updated to iTunes 8.2. The tutorial for the iPhone 3G version can be found by clicking here. The tutorial for the iPhone 3GS version can be found by clicking here.
The tutorial for Windows version can be found by clicking here
** If you would like to jailbreak on the 3.0.1 firmware you can follow these exact instructions; however, in Step Two restore using this 3.0.1 iPhone firmware file instead of the 3.0 one. Continue with the instructions as indicated.**
Create a folder and name it Pwnage on your desktop.
Extract the RedSn0w application from the RedSn0w zip file and put it in the Pwnage folder that you had created.
Connect your iPhone to the computer and launch iTunes.
Select your iPhone from the list of devices on the left. Now hold down Option and click Restore. 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 Open to continue.
Once iTunes has finished updating your iPhone to the desired firmware you may launch redsnw0w from the Pwnage folder on your desktop.
Once RedSn0w opens click Browse
Select the firmware ipsw we placed in the Pwnage folder on our desktop and click Open
Once the firmware has been verified click Next to continue.
Make sure Cydia and Unlock is selected and click Next.
You will now need to set the location of your bootloader files.
Click Browse and select the 3.9 bootloader file from the Pwnage folder on your desktop.
Click Browse and select the 4.6 bootloader file from the Pwnage folder on your desktop.
Click Next to continue.
Plug your iPhone into the computer and make sure it is turned OFF then click Next
RedSn0w will now guide you through the steps to get into DFU mode.
Hold down both the Home button and the Power button for 10 seconds.
Release the Power button and continue holding Home until RedSn0w detects the device.
Your iPhone will reboot now
RedSn0w will begin uploading the new RAM Disk.
Once the upload is complete you will be notified that RedSn0w is done. Click Finish.
When your iPhone finishes rebooting (it may take a few minutes). It will run BootNeuter and your Iphone then will be unlocked and jailbroken with Cydia on the SpringBoard.