@Nickdublin Start with upgrading firmware on your Deco M9 Plus unit to newer. Firmware 1.2 is so old, it can't be upgraded through Deco app. Follow this document: How to Update the Firmware of Deco...

@Monomer This is a feature.

@HuseyinB Here is a suggestion: delete M3W from your Deco app and see if "Mesh Technology" toggle appears. To delete M3W, find Reset a Deco unit and use Method 1 from the following document: How can...

@balaratnam There are no settings for this. Maybe it were removed in firmware 1.7.* for M5. My Main Deco is M9 Plus with firmware 1.6.2, I have it there. If you change Main Deco to M9 Plus, check...

Also, make sure NAS is set to get dynamic IP address, check its default gateway when it does - should be Main Deco. Same for PC you will hardwire and will be pinging from. Many issues with Deco mesh...

@peltsi51 Obviously, you should be able to at least ping NAS if it is connected to the router (Main Deco) and you are pinging it from device on the same LAN. Do you have any device with Ethernet...