At least you got a fix
Good to update with a fix on these threads
I think it was a 350 we had here with that - there was a card in the "owners wallet" with the radio code on it - enter that and it worked, was a while ago so might not have been a 350.
I did here a rumour that the radios are coded to the ECU but never had the standard radio long enough in any of mine to really worry about it.