Can't reset Slate AX

I have a Slate AX and after changing it to repeater mode, I am unable to factory reset it with the button and I can’t log in to the portal because nothing appears when I put 192.168.8.1. I have tried using with both the LAN and WAN My network doesn’t interfere with its IP. I have tried unplugging it and plugging it in and I have tried holding the reset button many times.

Could you please to follow this guide?

If this doesn’t work:

Repeater (WISP) or extender?

can you computer get 192.168.8.x IP from the router when plugged to the router?