@TP-Link Many thanks for your input! I was able to do the firmware 1.5.1 upgrade through the tplinkdeco.net web UI

@crizthebard Same here! I have a set of 3 Deco M9 Plus. Firmware version is 1.4.3 Build 20200921 Rel. 42500 But when I go to Update Deco in the Deco iOS app, I get the message 'Your Deco Home Wi-Fi...