The Dev Team is working on a solution that will allow the baseband downgrade for iPhone 3G/3GS owners, but before them, someone else was found to do this WORK. In this tutorial you will learn to downgrade the baseband for your iPhone 3G with baseband 06.15.00, HOWEVER, only those with bootloader 5.8 will be able to downgrade. ONLY those who bought an iPhone 5.8G before September 3 have bootloader 2008, the rest have bootloader 5.9 or higher. You can check which bootloader you are using f0recast.
For this tutorial you need:
- an iPhone 3G with baseband 06.15.00 and bootloader 5.8;
- ifunbox/discoid for Mac;
- fuzzyband installed from Cydia;
- afc2add installed from Cydia;
- certificate for fuzzyband, you can download the certificate from here.
I haven't tested this tutorial, I can't confirm that it works, you do it at your own risk!
Step 1
Open the Fuzzyband app and if you have bootloader 5.08 then it will start and tell you that you can downgrade.
Step 2
Connect the terminal to the PC, open ifunbox and navigate to Applications/Fuzzyband.app where you will copy the downloaded certificate.
Step 3
After you finish copying, disconnect the terminal from the PC and reopen the Fuzzyband application. You should have the option to downgrade to baseband 05.13.14.
Step 4
If the application allows you, downgrade and after the phone restarts, go to Settings>General>About and check what will be written on the modem firmware.
If everything is ok then you should have a decodable baseband through ultrasn0w and you will get rid of all the errors given by iTunes.
