I agree again, it's not always the case that the FADEC has to come off wing for new software - I did say that that's true for the B777/Trent800 (and I assume the same for the other engine options - I only have experience of R-Rs in this case). Earlier versions (RB211 for 747 and T700 for Airbus) needed to have the FADEC/FAFC off-wing and a card reprogram. I assume also that the newer aircraft will also specify on-wing downloads. I just wanted to make the point that you don't change a FADEC software by logging into Microsoft update and pressing OK, at least not yet...
VnV