My very friendly advice would be that if you are asking these questions you better not go there.
Car could be reprogrammed by a dealer or by independent shop or technician like me. I personally dont reprogram even my cars except it has to be done to fix a problem, change module,etc. Reprogramming can open another can of worms, so i dont recommend it to anybody who wants to do it for no reason.
The problem is that to upgrade the software in a control module, it has to be erased first. And sometimes after that it doesnt accept the new FW, SW or coding. It just becomes a paperweight. There are other problems that can arise too.