thisismyusername

my situation is a little different, I have the maps that I've transferred from my old xbox which had RROD, but they are signed to the right account. Pretty sure all I need to do in order to play them is install the 1.5 TU, is there a way I can do this without a JTAG? If so, could someone point me in the right direction on how to do so? Any help is greatly appreciated