1.1 2 Downgrade
If you upgraded to the latest iPhone firmware version 2.0 by mistake and bricked your iPhone or don't like the new upgrade here are simple to follow step by step instructions to restore iPhone or iPod Touch to an earlier firmware of your choice.
- Uninstall iTunes 7.7 and Install iTunes 7.5.
- Connect your phone to computer via USB.
- Turn off the phone.
- Place your phone in DFU mode (Device Firmware Upgrade) as described below:
- Push and hold Home and Power buttons on your phone simultaneously for 10 seconds.
- Release the Power button but keep holding Home until the computers beeps recognizing the USB device.
- You should be in DFU mode now.
Here are the video instructions for the steps above.