Thus days, there were guides floating on the web of using PwnageTool bundles to jailbreak iPhone 3G on iOS 4.1 by msft.guy. Well, I didn't post this guide because it's really difficult and needs a professional, so, we could get our hands on iOS 4.1 custom firmware already pre-jailbroken works on iPhone 3G. Check the steps below to restore it and jailbreak your iPhone 3G.
Step 1: Your iPhone 3G must be jailbroken on older firmware with Redsn0w, Sn0wbreeze or PwnageTool.
Step 2: Launch iTunes 10 and sync your device, back your data by right clicking on the iPhone icon at the left sidebar of iTunes and hit "Backup".
Step 3: You will now have to restore your iPhone to this custom firmware 4.2 (link at the bottom). Start iTunes, click on your phone icon from the sidebar in iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.
Step 4: After installation you may be promoted with errors (just ignore it). After installation, you will have fully jailbroken iPhone 3G works on iOS 4.1.
This custom firmware doesn't upgrade your baseband, so you may need to unlock your iPhone using Ultrasn0w by following the step by step guide posted here. Of course, you may need to downgrade from iOS 4.1 to iOS 4.0.2 / 4.0.1 by following the step by step guide posted here.
Also keep in mind that Sn0wbreeze 2.0 with iReb 4.0 will solve iPhone 3G and iPod touch 2G jailbreak. According to iH8sn0w it works perfect with no errors, Expect the release any time soon.
Download iOS 4.1 Custom Firmware [Mirror 1]
Download iTunes 10
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