The following method will help you downgrade the baseband of iPhone 3G from 06.15.00 to 5.13.xx, which is unlockable using Ultrasn0w. This method will also enable you to restore your device on the official stock firmware using iTunes which was otherwise not possible on iPad’s 06.15.00 baseband.
The method currently only works with the iPhone 3G with bootloader 5.8 and the procedure is pretty straightforward, although we would not recommend it to novice users. We also suggest that you back everything up on your device before following the procedure. Proceed at your own risk.
Disclaimer: This guide is for information and educational purposes only. Use it at your own risk, we cannot be held responsible if anything goes wrong.
Requirements:
- Jailbroken iPhone 3G
- Fuzzyband installed via Cydia
- afc2add installed via Cydia
- i-FunBox (for Windows) or DiskAid (for Mac)
- Certificate to use with Fuzzyband.
How To Downgrade iPhone 3G Baseband 06.15.00 to 05.13.xx With FuzzyBand:
Step 1:
Download the required certificate file ICE2-06.15.00.cert from here.Step 2:
Install Fuzzyband from Cydia, then start the application.Step 3:
Connect your iPhone 3G with your computer via USB cable.Step 4:
Start i-FunBox and click File, then navigate to Applications/Fuzzyband.app, right-click and then select Copy from PC.Step 5:
Select the ICE2-06.15.00.cert file you downloaded earlier and then copy it to this location: Applications/Fuzzyband.app.Step 6:
Now simply disconnect your iPhone from your computer and start the Fuzzyband app (which you previously installed using Cydia in Step 2) on your iPhone.Step 7:
In Fuzzyband, you will now see your current version of Baseband, (which should still be 06.15.00). But now you will have the option to downgrade it to version 05.13.xx.Once you have downgraded, Go to Settings –> About, and scroll down to check your Baseband which should now read 05.13.xx (which is unlockable via Ultrasn0w). You can now also update or restore any firmware without iTunes throwing errors.
[Source: iSpazio]
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