If your BTU was totally off, no power at all. You still may have chance to make the BTU revive by replace to new power adapter. Last time, I was faced the issue of my BTU suddenly off and I was tried to connect to wifi but can't access to internet.

I go to check my BTU and router. The BTU was powered off and can't power on. I plug to another power socket but still the same results. Finally, I was solved the problem by replacing to another power adapter.