Please take out the battery and check the indicator on battery. If it's red, please charge the battery until it turns green or blue, then try it again.
If the issue persists, please take off the battery and set it aside for 72 hours. Then put the battery back in and update your firmware to the newest version as soon as possible.
Make sure your finger is clean and try, then try pressing the fingerprint button to turn it on.
If the issue persists, please take off the battery and set it aside for 72 hours. Then put the battery back in and update your firmware to the newest version as soon as possible.