Cannot Restore iPhone 1G (EDGE)... Help!

[!LoL]

1. Go to the following website:

http://www.felixbruns.de/iPod/firmware/
2. Under the iPhone / iPod touch / iPad / Apple TV drop down, select iPhone (3.1.2/7D11) and save it to your desktop.

3. When it has finished downloading, plug in your iPhone. Where it says restore, do the following:

Hold Shift and click Restore.
4. Navigate and select the firmware you downloaded on your desktop.

5. Click OK and see if it restores accordingly.