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Also some more info if it helps: the chromecast shows up on my tv but my device (iphone) says it's an untrusted device/ firmware problem.

Same here, the chromecast shows up on my tv but my device (iphone) says it's an untrusted device/ firmware problem.

I'm in the UK using a Chromecast device that is at least 10 years old, I don't know the number. Morning of March 9th it worked fine, yesterday evening and today says it's an untrusted device. I tried resolving it via Google Home to no avail. Unplugge...