Well in that case, all i can think of is to create a new ID in the deco app. If you are on android, I suggest you clear the "cache" and "data" in the app settings for deco app before creating a new ID

@JamesUK https://static.tp-link.com/2020/202007/20200715/M9Plus_2.0_upgrade_tool_v1.1.1_macOS.zip

@Lincoln Have you tried running the update app in COMPATIBILITY mode under windows 10?

@itismeTravis Please update the firmware of all your Deco M9 again using the tool.Run in compatibility mode under windows 10 Download the update tool from here AGAIN : (Delete already downloaded tool...

@JamesUK Please update the firmware of all your Deco M9 again using the tool. Run in compatibility mode under windows 10 Download the update tool from here :...

@Ngallow Looks like its bricked. Only TP-Link can help in this.