No double flash just 1 quick flash. Looking at the rec the ground (black) wire on the right. So I'm guessing hold the blue button down before powering up the truck. Then hold the button on the back of the radio while turning on the radio with you toe

I'll try to reverse the wires to see if I get the double blinking.
SWEET, just tried what I just said above. I never tried to hold the button down before powering up. DONE! Thanks for the tips.