Step 2: Download i OS 4 (not i OS 4.0.2) for i Phone 3G to your desktop from our i Phone downloads section. Since i OS 4.0.2 didn’t update the i Phone baseband, you can still use Ultra Sn0w to unlock your i Phone.
Step 3: Update your i Phone to i OS 4.0.2 via i Tunes. Step 1: Jailbreak your i Phone using the method described above. If it’s not there, you might have to add the following repo: repo666.ultrasn0Step 3: Install Ultra Sn0w. Tell us how it goes for you by leaving a comment below.
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The next step is to download the appropriate firmware for your device.
To jailbreak your i Phone 3G 4.0.2, you will have to use Red Sn0w 0.9.5b5-5.
Well I will tell you how to restore you i Phone back to it's factory settings in a few simple steps.Once the restore process has completed your i Phone will restart and the Apple logo will appear while booting up.Those of you who own an i Phone 3G or an i Pod Touch 2G (non-MC model) can jailbreak/unlock i OS 4.0.2.Step 4: Download the latest version of Red Sn0w from here. Step 5: Point Red Sn0w to the i OS 4 (not 4.0.2) you downloaded in step 2.