Thanks, i'm not sure to understand 100% of what you said but i'm gonna try.
So just to be clear, i have 2 choice
1) reset the rx500, but instead of doing the setup offline then connect the xr500 to the router, i connect the xr500 to the router directly before the reset ?
or 2) change the IP LAN of my internet router. Bt what should i put in that "LAN IP" thing exactly ?
Important information, i managed to get internet while being connected to the xr500 by putting google dns inthe ipv4 & ipv6 of internet router, problem is i can't access the xr500 interface at routerlogin.net (it redirect me to the website) and the ip is now 192.168.1.50 (it doesn't work if i enter it) Maybe it's not important but, eh !
I'm adding some screenshot of my router interface if it can help