@David-TP Yeah i don't want to use Bridge Mode and i want to use IPV6 as a Dynamic IP Address from Deco to connected clients.

@Abhinav123 Yeah ofcourse M4 will improve wireless signals and all Deco's are compatible to connect to each other.

@MortenWith Check QoS and turn it OFF or set the limit to 1000 Mbps

@MortenWith Check QoS and turn it OFF or set the limit to 1000 Mbps in QoS

Today i was trying to setup IPV6 on my Deco M4 but my Deco got IPV6 address and DNS but could'nt provide IPV6 address and DNS to connected clients and even i tried every options which are available...

@Bugs22 Wireless Backhaul took 30-40 seconds for me after reboot or sometimes 1-2 minutes and Wired Backhaul took around 5-10 seconds to connect after reboot everytime. Yeah you are right (Wired)...