Recently, I have worked and tested on upgrading the iPhone 2G from OS 3.0 to 3.1.3 that is locked to AT&T. I followed the instructions from iClarified by using RedSn0w to unlock and jailbreak the iPhone 2G. Somehow, I found there is a bit unclear on the instruction steps that mislead over to an error of “Unable to recognize specified IPSW” for me.

Obviously, I was panic at that moment that the phone almost turns to be brick as I can’t activate the phone and it is locked to AT&T as well.

But no worries now, it is fixed. All you need is to upgrade to OS 3.1.3 and run RedSn0w with OS 3.1.2 Firmware in order to unlock and jailbreak it. Please note, only applied to iPhone 2G!

First, Download the following files and place them in the Pwnage folder you just created:

- RedSn0w
- BL 3.9
- BL 4.6
- 3.1.3 (2G): iPhone1,1_3.1.3_7E18_Restore.ipsw
- 3.1.2 (2G): iPhone1,1_3.1.2_7D11_Restore.ipsw

Second, connect your iPhone 2G to computer and launch iTunes. Select your iPhone from the list of devices on the left. Now hold down shift and click the Restore button. Navigate to the Pwnage folder on your desktop and select the firmware ipsw. Click the Open button to continue.

Third, once iTunes has finished updating your iPhone to the desired firmware you may launch redsnw0w.exe from the Pwnage folder on your desktop.

Fourth, once RedSn0w opens click on the Browse button and select the OS 3.1.2 firmware. After that, it will show “IPSW successfully identified”. If you have selected the OS 3.1.3, it will show the above error “Unable to recognize specified IPSW”. So make sure, you select 3.1.2 when unlock and jailbreak.

Fifth, from this window you can select “Install Cydia” and “Unlock”. If you have already pwned your device selects the “Already pwned” option. Then press Next button.

Last before complete, you need to specify the location of the 3.9 Bootloader and 4.6 Bootloader, press Next to continue. It is necessary to unlock the iPhone 2G. Now, plug the iPhone into the computer and make sure it’s OFF then click the Next button. RedSn0w will now guide you through the steps to get into DFU mode to upload the new RAM Disk and Kernel.