@SayeemAhmed Hmmm right

@David-TP This is my ethernet switch/splitter and idk about model number. Yes all the Deco start flashing red.

@HelpFixDecoApp Thanks for your help...I'm waiting for the reply of @David-TP

Hey TP-LINK !! Since i start using ethernet backhaul on one of my satellite deco unit idk why deco create ip conflict problem with main deco unit after i reboot that satellite deco unit internet...

@MikeEvens Change the DNS server 8.8.8.8 and 8.8.4.4 in Internet Connection settings and DHCP Server.

@ImtiazAli Yes we need WPA3