funny username you have (IMG:
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but, 40 watt iron... OMG... you will burn the traces of the mainboard if you are not careful. but, 40 watt will do fine, if you keep that in mind. if you are not that handy, try something like a 15 watt iron. i personally like to use a 15 watt iron, if you keep the soldering iron a little bit too long an a pad, it will not burn it off immediately. it will be burned off, if you keep your 40 watt iron on a pad to long!
well, if you already uncrippled a xbox, jtagging would be a piece of cake. since the jtag wiring is really easy to solder on a xenon. just pre-tin your stripped wire and pretin your soldering pads on the mainboard. then just put the pre-tinned wire on the pretinned soldering path, reheat the pretin wire a little bit and you are done! the lpt soldering points are really, really easy if you use the bottom points (then the elco's are not in the way). same for jtag wires, if you solder them underneath the board you have plenty of space.
you can use flux etc, i never use it (hard to get where i live, haven't found a shop that sells it!). but flux is not needed for a xenon, or at least that is my opinion!
for the xenon jtag wires you do not need the diode soldered directly onto the board, you can solder them inbetween 2 pieces of wire (that is how i did mine, works fine).
good luck
Thanks for the info bro, you've helped me a lot with your message and I hope it also helps OP's problem (IMG: