@Alexandre. This did the trick. Manual update through the Update Tool first and then when I opened the Deco App it found an even newer version I could install and now everything is at it should....

Hi, I have the same problem. Running the latest version of Apple iOS 14.2, TP-Link Deco App version 2.4.10 and lastly my Deco M9 Plus system is still on 1.2.11 Build 20190926 Rel. 55727 even after...