@Tantalum Is it possible Internet is down at your place? If not, this is as far as I can assist. You may wish to contact TP-Link Support, now that you simplified your setup they may be able to assist.

@Senna7004 That would work, but I would suggest connecting both wireless M9 Plus to wired M9 Plus, if distance between them is acceptable. If not, you can just leave them as is. You can configure how...

@NoviceNoddy Main Deco M5 is capable of delivering up to 500Mbps speeds over WiFi, in tests I did with mine (I have gigabit Internet and could run M5 to its max). If they gave you a router and you...

@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...