@David-TP more than 2 months gone, but no solution...

@GrimReaper It's an A53 issue, search before you post: New Samsung A53 can't connect stable to Wifi on Deco X60, connection keeps dropping Samsung Galaxy A53 can't connect to mesh wifi (TP-Link Deco...

@MinhKunn The 1.6.0 firmware hasn't been released for Deco M4 yet

@LukePL Written on the packaging Written on the bottom of the router ("Ver.: x.x") Mentioned in the firmware update page of the web UI

@Rickyboy Yes, it's possible if you have the latest firmware (1.6.5) How to select a preferred signal source on the Deco App (See Part 2)

@DufordDawgs The latest firmware for Deco M4 (V4) is 1.1.0 You posted the hardware version or firmware version wrong