[KIOWA69]

Your best bet is to make a back-up of the sd card so if you do happen to mess something up then you can always put those files back on the card and then be good to go. I don't know if your planning on rooting the phone or not, but it's always a good idea to make a back-up of the sd card and if rooting to create a nandroid so that you can save those wimax keys in case you do something to them, that's if you even care about 4G.

While I'm bored and babbling lol, you have two ways to make that back-up of the sd card, one is to hook up the phone and connect as a disk drive and then copy and paste to a place on your computer, second way is if your rooted to do it through recovery usb.