Disclaimer: As with all 'illegal' hacks on your iPhone, we accept no responsibility if this bricks your iPhone as we have no knowledge of what you've done before to your iPhone, so please don't come crying to us if it all goes wrong.

After installing iPhone OS 4.0, you will lose your jailbreak and unlock on your iPhone and iPod Touch, and given that it is as buggy as hell, you'll probably want to downgrade immediately. If you are looking for a solution to downgrade iPhone 4.0 firmware to 3.1.3 then follow the steps below.

Downgrading from 4.0 (beta) to 3.1.3 on Windows (Mac Users)

You will need:

• iTunes 9.1
• Original firmware 3.1.3 (2G, 3G, 3GS)
• iRecovery v 1.3 & Libusb

The Process to downgrade

1. Extract the file “iRecovery” on to your desktop
2. Install “libusb-win32-filter-bin-0.1.12.1.exe” and keep the file on the desktop
   
3. Connect your iPhone via USB and put it in DFU mode (hold down the button “Power” and “Home” for 10 seconds then release).
4. Restore and manually load firmware 3.1.3 (by pressing Shift + Restore and select the firmware you downloaded previously).
5. Towards the end of recovery, the procedure will stop and return the iTunes error 1015. Ignore this.
6. Click OK on the pop-up, Close iTunes and run the command console, typing the following commands:
   • cd Desktop (or folder where you copied iRecovery)
   • iRecovery.exe -s
   • setenv auto-boot true
   • saveenv
   • fsboot
   • exit
     
7. Unplug the iPhone from your computer and restart it by pressing the Power and Home until the Apple logo appears. Once turned on, connect to your computer, activate it and use it normally. Your downgrade should now be complete and you will be back on 3.1.3 for iPhone.
   

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