Table of Contents1 Disclaimer2 Credit and Additional Resources3 What Happened?4 What to Do If You've Factory Reset Your Device5 How to Fix It6 The Technical Research Process On March 9, 2025, many Chromecast 2nd generation and Chromecast Audio devices suddenly stopped working. Users like me could not cast content or set up their devices. This wasn't due to a software update or planned obsolescence, but most likely an expired device authentication certificate. Disclaimer USE THESE WORKAROUNDS AT ...