The Xenium adapter will NOT work in the X-Chip. The Xenium adapter is basically the same as the Chamelon adapter and will not work for models 1.5 without soldering. It is also lacking pin #6 which the X-Chips needs.
You must have a X-Chip adapter in order to use the X-Chip if you want a solder-less install up to Xbox version 1.5
The X-Chip adapter does work on Chameleons but the Chameleon/Xenium adapters will NOT work with the X-Chip without soldering.