@calmgate Any Deco model with Ethernet port can use TP-Link powerline adapters. I googled FRITZ!REPEATER 3000 and it says it is WiFi6 capable. If you want replacement to similar Deco, I suggest...

@Tantalum For troubleshooting, simplify your setup: bring Main Deco to garage, connect it directly to the modem/router. Does that work? If it does, connect Main Deco to TP link 8 port TL-SG108 in...

@BruceA Here is the better way: 1. Keep Hub 3 in its current mode, don't make configuration changes in it 2. Switch Deco mesh to run in Access Point mode: How to set up Deco to work in Access Point...

@Senna7004 If you plan to add XE75, the best approach would be to have XE75 as Main Deco. How many additional Deco XE75 units you plan to add to your three Deco M9 Plus? Do you plan to keep M9 Plus...

@Senna7004 In general, newer WiFi protocols mean faster speeds, but shorter distances. WiFi6 will be faster than WiFi5 when standing near the WiFi node, but as you walk away WiFi6 will be more...

@Senna7004 Have you considered to just add more M9 Plus Deco? Also, what is the speed of your Internet link? WiFi 7 hardware is usually expensive, and makes sense when Internet speed is over gigabit.