And yet, NASA frequently updates code on launched vehicles. In fact because of schedule and orbital mechanics, Spirit and Opportunity were launched before final

And yet, NASA frequently updates code on launched vehicles. In fact because of schedule and orbital mechanics, Spirit and Opportunity were launched before final flight code was ready, and an OTA was performed while the vehicles where in flight: http://spacenews.com/jan-15-2004-spirit-rover-begins-amazing-visit-mars/ http://spacenews.com/jan-15-2004-spirit-rover-begins-amazing...