I want to load a "stock" non-modified tune - I think I found one - but when I tried to load it - it said "different operating system" so checking other buttons/options I see there is one to load tune with different operating system. Since I am totally newbie - I wanted to ask if there are any "gotchas" to this procedure? Will I be able to re-load my current loaded modified tune - after loading a base tune with different operating system number? Thank you in advance.