Few days ago a new exploit allowed developers to downgrade iPhone 3G baseband from 02.30.03 to 02.28.00 running Bootloader v 5.8, the hack allowed users with iPhone Firmware 2.2.1 to get their phones unlocked via Yellowsn0w after successfully downgrading the baseband, earlier the downgrading process required users to upload files via SSH and executing it via shell, the developers have now created an easy-to-use automated GUI for downgrading the iPhone 3G Baseband automatically with minimal user interaction.
To downgrade follow the steps below:
- Launch Cydia.
- Search for "3G Baseband Downgrade" and install it.
- After installing, launch application from Springboard and follow onscreen instructions.
- Restart your device to complete the process.