Have 3ds xl with 4.2 firmware, issue with installing rxtool, black screen.

ok, I have 3ds xl with 4.2 firmware and a gateway and a blue card. I tried to installrxtool with no success so I decide to wipe the 3ds xl and the sd card and start over and I did the following:

Reinstalled gateway and emunand.

install the mset 4.0 boot from blue card

put the following on the root of my sd card

RXtool folder
Firmware.bin
slot0x25KeyX.bin

And then I went to profile and ds mode and press L

got into rx menu but when I try to boot into emunand, the screen just turn back.