How do you change the Fiat punto ECU?

Fiat punto ecu is bolted onto the throttle housing (manifold) remove air filter and at rear of throttle housing you will see 2 x multiplugs (release by swinging clips 90 degrees) these plug into ecu (4 bolts) Unfortunately new or replacement ECU,s need reprogramming. Although if changing an engine over you must swap Ecu and keep original or key won,t identify code.