@ayaniv Well, that was the last thing that I would guess - a blacklisted device. It's good that you've checked the Access Control as well.

@ayaniv From your second screenshot is visible that you haven't connected to your router Wi-Fi. Get rid of the Static IP Configuration (check this post) and try again.

@ayaniv A Parental Controls configuration can cause this issue - details.

@Lordalpha You should use at least the ethernet cable that is connected to the AX55 Internet (blue) port - this is shown in the screenshot of my previous post..

@Lordalpha Yor router model is most probably AX55 - that's on your bottom sticker (details). Check your ethernet port status negotiated speed here: You may try another ethernet cable of a good...

@MariaClaudia WPA2-PSK (AES) would be fine. Configure nothing more on this device - it's a simple AP now and that's enough.