Ok, my 360 is flashed and everything works perfect, but I don't have the original firmware (formatted my comp and forgot to back it up). If my friend's 360 has the same model drive as me, can I use his firmware on mine? Or would it not work that way? If my drive ever f**ks up, could I buy a new drive and install it myself? Or would I need to buy the exact same kind and patch it using the firmware from my friend's drive?