Thanks @Kevin_Z , that did it, I didn't even knew the router configuration page, but it had indeed fixed values for the upload and download speed, maybe they changed them in the shop I bought it to...

Hi, I have a PC wired (CAT5e) to mi modem on another room, with that I get this internet results: I wanted to extend my wifi so I bought the AX3000, pluged it to the same cable I had my PC, and then...