@Nigelandre You have three options: 1. Use another C54 in RE mode (check this post). 2. Use a dedicated RE of your choice 3. Use another router in AP mode connected to C54.

@FishhyFishCakes Well, that was the point - to isolate guests in another VLAN (a different network subnet) so other users couldn't see them and vice versa. If you want this to work your main router...

@tkurtulus Check this post for recommended steps.

@FishhyFishCakes The only way to separate users in different networks is to use the Multi-VLAN mode configuration for TL-WA1201.

@ujjal1960 To reset your router to its factory defaults press the reest button for about 10 seconds, then re-configure from scratch. The default one is admin (all lowercase) for both username and...

@SabbyZ If you've reset your C20 to its factory settings here's how to configure from scratch.