And after we set up all the necessary little things on the form, Microchip(c) wll make this tiny change and screws everything

OK, I am joking, but the Form/SQL may have to be prepared for such a case.

Fuse settings is a good starting point as there is a lot of confussion on this. Every time I change a chip I have to scan the fuse settings which arfe not very obvious sometimes.

Ioannis