@Orental5 

Welcome to the community.

I see the Deco X20-DSL is online now under your TP-Link ID from the cloud server and have you fixed the issue by yourself already?

If yes, would you mind sharing with us how?

Or actually, you already reset it again and now the Deco starts working again?

If it is the case, have you ever saved any screenshots of this error message during setup?

And it is also highly appreciated if you could record a short video clip about the setup process.

Thank you.

Best regards.