@malada If you choose AXE4900 you'll get a whole home mesh system and won't need any additional range extenders. If you don't have any Wi-Fi 7 capable client devices then nothing to worry about (both...

@MortyNT Go for the Archer if you prefer to have a WebGUI for device management.

@Marksym Upon successful reset connect a computer to your C54 LAN port and do the initial setup (set an admin password). Then you can change its operation mode and continue setting up the router.

@Chy12 Go through this guide for your issue.

@Skinny-Lettuce It's highly unlikely that a network loop would occur in a local network like yours, so leave it as it is - off.

@jrbateman Have you tried to configure AX1800 in AP mode (Case 1) and check if there's difference.