@Selik Let's check two common things first, and if they won't help I can offer you another test/workaround you could try. It is possible this is an issue with older version of Deco firmware. Please...

@Achilleas You have found perfect spot for 1st floor Deco, and it is unfortunate that there are no electric outlets near stairways on the 2nd floor. The plan would have been to place fourth (new)...

@sujeto117 It is possible. See this TP-Link FAQ: https://www.tp-link.com/us/support/faq/1794/

@sgtjjj See this forum topic: https://community.tp-link.com/en/home/forum/topic/536904

@mmaypo I have M9 Plus in AP mode, they work just fine. You do realize that "connected no Internet" could mean your devices do connect to Deco WiFi, but because OpenWRT router is now managing the...

@Selik I wonder why do you have an exclamation mark on the screenshot: it is usually a sign that something is not right. What is firmware version of your Deco M5s? How many Deco M5 do you have in...