How to Downgrade your Bootloader with ZiPhone (Windows)

Step by step instructions on how to downgrade your iPhone 4.6 Bootloader to 3.9 with ZiPhone instantly! No downgrading then upgrading!

To do this downgrade you must have restored your iPhone to 1.1.3 and then followed this tutorial to unlock.

WARNING: THIS TUTORIAL HAS A HIGH LIKELIHOOD OF BRICKING YOUR IPHONE. ANY TINY MISTAKE OR PROBLEM CAN MEAN A BRICK FOR GOOD!

Why would you still want to do this? The 04.03.13 baseband can be unlocked on 3.9 BL. This means you can have Google Locater working. Also, all old secpacks will not validate on 4.6. The 4.6 Bootloader requires a secpack of a newer version to let you do things with the baseband; whereas, the 3.9 BL requires the same version OR newer.

Perform these steps with your iPhone on and connected to your computer.

Step One
Download ZiPhone from: here

Step Two
Double click ZiPhone.zip on your desktop to extract the folder ZiPhone..



Step Three
Press the Windows key and R at the same time to bring up the Run window. Type in cmd and press the Ok button to launch the Command Prompt.


Step Four
Type the following command into the Command Prompt to navigate to the ZiPhone directory:
cd Desktop/ZiPhone.


Step Four
Execute the command ziphone to see all its possible uses.


Step Five
The program will prompt you to put your iPhone into recovery mode. To do this please hold down both the Sleep/Wake and Power buttons until you see the Apple logo. Once the Apple logo appears release only the Sleep/Wake button until you see the iTunes logo and cable on the screen.


Step Six
If you have a 4.6 BL iPhone you can now downgrade your bootloader! Just simply type in this command:
ziphone -b -v


Step Seven
The program will now search for zibri.dat. Then it will search for the iPhone. Once found it will tell you to wait for 2 minutes and 30 seconds.


Step Eight
After this time your iPhone will reboot and it will be bootloader downgraded to 3.9 with the 04.03.13_G baseband!