The One M8
is a smartphone released by HTC that runs on either Android or Windows. It includes an optional fastboot feature
that enables you to turn on the phone more quickly than when it is not activated. Normally, fastboot mode is a convenience. However, as it stops the phone from ever fully powering down while enabled, it is not ideal for performing troubleshooting and repairs.
This FAQ will show you how to disable the fastboot feature on your HTC One M8.
Turn Off HTC One M8's Fastboot Mode
Go to Settings
Uncheck Start up and shut down quickly