Updating your camera firmware can improve things like menu navigation, bracketing options, noise reduction, high ISO performance, focusing precision, auto white balance improvements, and more. Updates to firmware can also include proper functionality with new camera accessories such as vertical grips, flash units, and lenses. And, brand new cameras will often have some “bugs” that get resolved through firmware updates (”5D’II black dots” ring any bells?).
So here’s the basic process of updating your camera firmware — it’s not hard, you just have to follow the directions given by the manufacturer. And this stuff should hold true for ALL digital cameras, not just dSLR cameras.