Numerous users of Chromecast Gen 2 and Chromecast Audio are currently facing issues when using their devices. An error message stating “Untrusted device” is preventing them from casting content as usual. This problem was first reported on Reddit and gained attention on r/googlehome, with many users unable to cast any content using their devices.
The issue arises when users attempt to send videos or music to their Chromecast Gen 2 or Chromecast Audio, triggering a notification stating “Untrusted device: [device name] couldn’t be verified. This could be caused by outdated device firmware.” This message appears in various casting-supported apps like YouTube when selecting a Chromecast device as the destination.
As a result, users are unable to cast any content, and basic troubleshooting methods such as rebooting or resetting the device have proven ineffective. However, the screensaver function continues to work normally. Although the “Untrusted device” message raises concerns about Google potentially ending support for older Chromecast models, tech experts speculate that this issue may be a bug resulting from a software update or technical glitch, as Google has not officially announced the discontinuation of support for Chromecast Gen 2 and Audio, unlike the first-generation Chromecast.
One Reddit user theorized that the issue stemmed from “an expired central certification authority on March 9, 2025,” causing Google’s server verification for Chromecast Gen 2 devices to fail. Chromecast Gen 2 and Chromecast Audio, which were launched in September 2015 with firmware version 1.56.x, are affected by the “Untrusted device” problem experienced by users worldwide.
This issue appears to be limited to Chromecast Gen 2 and Chromecast Audio, as users have reported that newer models like Gen 3 and Ultra are unaffected. Google has been made aware of the problem with Chromecast Gen 2 and Audio and is working on a prompt solution.
Currently, users can only await a fix from Google as there are no DIY solutions available. Google advises against factory resetting the device as it may not resolve the issue and could potentially worsen the situation.
TLDR: Users of Chromecast Gen 2 and Chromecast Audio are experiencing casting issues due to an “Untrusted device” error, likely stemming from an outdated certification authority. Google is aware of the problem and is working on a solution, cautioning against factory resetting the devices.
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