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The following tutorial will teach you how to downgrade your iPhone 3G [ 5.8 bootloader] Baseband from 06.15.00 to 05.13.xx. By doing this downgrade you will be able to restore your iPhone 3G to any official firmware through iTunes and will still be able to unlock it with Ultrasnow.

Supported Devices:

• iPhone 3G 5.8 Bootloader

Requirements:

• Jailbreak your iPhone 3G using Redsnow 0.9.6b4 tutorial [Skip this if your iPhone is  already jailbroken]
• Install Fuzzyband via Cydia
• Install Afc2add via Cydia
• Download i-FunBox ( Windows ) or DiskAid ( Mac )
• Certificate to use with Fuzzyband

Follow the tutorial below to downgrade your iPhone 3G ‘s baseband from 06.15.00 to 05.13.xx

1. Download the required certificate file here.
2. Run Fuzzyband on your iPhone 3G
3. Connect your iPhone 3G to your PC via USB
4. Run i-FunBox and click on File > Applications > Fuzzyband.app then right click and then select Copy from PC
5. Select the ICE2-06.15.00.cert file previously downloaded and copy it to “ Applications > Fuzzyband.app”.
6. Disconnect your iPhone 3G from your PC and start Fuzzband
7. Tap on “ downgrade to version 05.13.xx “ and you are done!

Check your baseband by navigating to Settings > About, and if it reads 05.13.xx you have successfully downgraded your iPhone 3G ‘s baseband from 06.15.00 to 05.13.xx.

You can now unlock your device with Ultrasnow by following this tutorial.

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Tags:downgrade baseband 06.15.00 to 05.13.xx iOS 4.2.1,downgrade iPhone 3GS baseband 06.15.00,downgrade iPhone baseband for unlock,Jailbreak iOS 4.2.1