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Is it possible to replace the firmware on LG or other smart TVs with this?

Is there an OSS alternate smart-TV firmware community?

Yes, there is SamyGO, which is dedicated to Samsung TVs. https://wiki.samygo.tv/

There are custom firmwares, rooting methods, compatibility tables, etc.

There are forums where people root and hack on their TVs. I just saw a zero-click exploit for webos fly by my Twitter feed yesterday.

Thanks for that info, that's really interesting!

I made sure to turn off auto-updates on my C9, and when the warrenty expires there's hopefully some really cool things for me to try!