Figured out how to update the Chromecast ultra firmware (i think). I joined the preview program in the settings, then pulled power and started again a bunch of times. Now I got
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How to Update Chromecast
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Chromecast original ganha primeira atualização em mais de três anos
how to update chromecast firmware manually Archives - Switched On Network
How to Update Chromecast Firmware to Latest Version
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How to Update Chromecast
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/s.glbimg.com/po/tt2/f/original/2016/10/04/chromecast-ultra-na-home-2.png "Como aderir ao Chromecast Preview e instalar o firmware mais recente")