@Sybren All Deco models are compatible to each other and you can have a mix on different models in your mesh network - details.

@RobertoMario If your LAN is (for example) within 192.168.1.0/24 subnet for stability and easier management I would do the following: Set both REs that are in AP mode with a static IPs outside MR600...

@RoadRoller You can go ahead and install this FW release. (UN) comes from universal.

@PatK This guide should help you to configure your nano router in client mode and transform your printer in a wireless client device.

@WestOfBen The reason you can find this model is that it's targeting ISPs and its firmware is not supported by the community. You should follow up with your ISP regarding this issue and ask them for...

@Morkhod To be able to select wireless channels you have to disable Smart Connect feature.