Step by Step Instructions
Step 1: Make sure your iPhone is jailbroken on whatever firmware version you are. If your iPhone is not jailbroken, check the "References" section below for jailbreaking iPhone 3G links. Make sure you use TinyUmbrella software that updates the firmware without updating the baseband.
If your iPhone is jailbroken, continue reading below…
Tap on the Cydia icon to launch Cydia application.
Step 2: Once the Cydia application is ready for use, tap the Sections button in the bottom. Search through the available categories and select Systems.
Under the Systems tab, search through to find Fuzzyband 4.1.
Step 3: Tap on Fuzzyband and press the Install button located on the top right corner. Now, press the Confirm button to continue with the installation.
Once the application is installed, you will see a Return to Cydia button. Tap on the button to return to Cydia and then press the Home button to return to Springboard.
If you don’t see the Return to Cydia icon, you may notice that your iPhone restarted automatically.
Step 4: On your iPhone SpringBoard, tap the Fuzzyband icon to launch the application.
If your iPhone has a supported version of boot loader, you should see a message that you are able to downgrade your iPhone baseband.
If your bootloader is not supported, you will see a message that says, “Fuzzyband cannot be used on this device".
Step 5: If your bootloader is supported, press the Downgrade button to downgrade your iPhone baseband. Once the baseband is downgraded you should see a Done button and a message that says, “I HAZ DOWNGRADE".
After the baseband has been downgraded you may install UltraSnow from the Cydia app to unlock your iPhone.