How to fix iPhone 3G Random Error 1645.

I kept getting the Unknown 1645 error. iTunes wouldnt let me update/restore my iPhone. Until I came across this, which worked and now my iPhone is fully operational again. I hope others who are experiencing this Random Error 1645 come across this thread.
1. Disconnect your iPhone cable but leave connected the other USB end to the computer.
2. Turn off your iPhone holding the Sleep/Wake button. The red slider bar appears. Slide the bar and wait until the iPhone turns off. Or you could hold the Sleep/Wake and Home buttons at the same time until the iPhone turns off.
3. While pressing and holding the Home button connect the USB cable to your iPhone. It should power on. Hold the Home button until you see the Connect to iTunes message. Open iTunes if necessary. You should see the iTunes detected an iPhone in recovery mode... alert screen.
4. Choose Restore.
Thanks.
iMac Mac OS X (10.5.8)