i have downgraded succesfully my N3DSXL!!!
this is my info:
N3DSXL region:EUR
factory firmware:9.6.0.24E
updated to: 10.3.0.28E
downgraded from:10.3.28E to 9.2.0-20E
hax used:homemenuhax
thanks at all and a big big big thanks at cpasjuste for his work! ;)