Before I tried macbook and uboot works. Pls watch the video and follow it carefully. Most important point:

  1. Only connect one cable from macbook to the router
  2. Connect the cable before powering the router
  3. Pls make sure your browser is not redirected to https. Only use http
  4. Turn off any vpn or proxy in your system if you have

If you tried everything but still does not work, need to change to another pc.