Router mode Nebula FWA505

Hi everyone

I bought a Zyxel NR7302 and installed it; it works fine. I connected it to a Nebula FWA505 with the cable and set it up as a router. However, after doing this, I can no longer access the web login address on NR7302 (I changed the login address). Although I tried other routers and they worked normally, I think the problem is with the Nebula FWA505. I hope you can suggest a solution for me. Thank you.