The M8 vibrated. The screen on the device flashed a warning: Updating System... Do not disconnect.
If you must keep using the HTC One M8, do not rely on the stock ROM for security. Instead: htc one m8 stock rom updated
On its final stock ROM (Android 6.0 + Sense 7), the HTC One M8 is a stable, elegant daily driver for light usage – calls, music, YouTube, Reddit, remote control, and retro gaming. The standout features remain the front-facing BoomSound speakers , IR blaster , and Duo Camera refocus effects . It struggles with modern heavy apps (Chrome, heavy games), but for a 2014 flagship on its last official software, it’s surprisingly polished. The M8 vibrated
If your device is currently on an older version (like KitKat or Lollipop) and does not show an Over-the-Air (OTA) update, you must use an RUU. If you must keep using the HTC One