Where can I find the "hack4legend" or "Legend Downgrading Tools"?
I have finally found a working link for hack4legend: http://www.mediafire.com/?w32aen59riz8qnn

It came from yet another guide: http://technologic101.wordpress.com/2012/05/31/tutorial-how-to-downgrade-htc-legend-from-android-v2-2-to-v2-1-100-working-with-hboot-1-01/