I did get a response on this thread
https://www.googlenestcommunity.com/t5/Chromecast/Can-t-do-a-factory-reset-with-chromecast-with-Google-TV/m-p/359444#M36796
- It was to try another TV which I had already done. So mine is in the
garbage. Good Luck ...
Search the community for other similar posts. Seems this is a problem
for several people
https://www.googlenestcommunity.com/t5/Chromecast/Chromcast-With-Google-Tv-stuck-on-G-logo-screen/m-p/323966#M32940
including myself