Question: How to edit to give yourself an instant promotion?

[Mobhack]

The rank is only a title, ie a different string. It does not a thing as of itself.

In long campaigns, the unit may have its rank title upped as it progresses (or downgraded if wiped out) - but that is purely a cosmetic beside te real effects of increased/decreased EXP, MOR and the various leadership values etc as it progresses and gains or gets wiped and regresses.