@01fh I did notice that the only version of firmware posted for the 245v4 seems to 'recommend a 5.x' controller and you are still on v3.x right? Can you try a temp second instance of a v5 sw...

@Nvb2 Regarding Question 2: The Omada controller can live anywhere in your network as long as it has access to the management VLAN--it doesn't have to be on the router or top level switch. If you are...

@Nvb2 Regarding question 1: Why not just configure 5 of the ER707 ports as LAN ports and plug the 4 non-POE devices directly into it? If you have some complicated VLAN stuff that needs to be...

@ChandlerBing What IP is your ER605 reporting on it's WAN interface?

@01fh Maybe use a VLAN ID other than 1? That one is 'special' in TPlink Omada land.

@ChandlerBing Then it sounds like you don't have a public IP on your WAN from your ISP.