@cheeseburger467 If you plan to use Ethernet backhaul for X20, that won't slow down your Deco mesh. As long as you can have X20 wired in such a way it can use Ethernet backhaul, and your networking...

@qqdad There is 2.8 firmware on US and Canadian TP-Link Web site, but it is quite old. If you can't find 2.8 firmware page at your regional TP-Link web site, perhaps you bought your M9 from different...

@glenb You need to upgrade Main Deco M5 to firmware 1.6 beta, which has an option of turning off Smart DHCP for Deco running in AP mode. See here: [New Firmware] Deco M5 1.6.0

@AK32 A lot has changed since 2020, when this topic was discussed. By utilizing Deco Guest Network, you can have two different SSID: one for 5GHz and one for 2.4GHz.

@Pip60 See if this forum conversation can give you ideas, it is for S4 but M4 is similar and also there is general discussion on that topic with helpful hints: Deco S4 power adapter barrel plug size

@MariaZika You can try my recommendation, and if you find Access Point mode is not working for you, you can change it back to what it was before, i.e., Router mode. I run my Deco mesh in Access Point...