If your TimeMoto Clock shows "Authentication Failure" on the display, the device is unable to perform certain internal checks.Authentication failureRestart your TimeMoto Clock by removing the power plug, and plugging it back in. You do not lose any data if you restart the device in this way.If you do no longer see "Authentication Failure" on the display, your time clock is working properly again.Should the message still be displayed after restarting the time clock, or your device does no longer start properly, it might require repair. Please use the form under "My Returns" on www.safescan.com to receive further information about the repair procedure.If your TimeMoto Clock still starts properly, but shows the “Authentication Failure” after a while, you can fix this problem without sending the device in. For this, you will need a FAT32-formatted USB drive. Also, your time clock must be updated to the latest firmware version. You find more information on finding your firmware version and updating your time clocks in the following articles: Updating the TM-616 & TM-626 FirmwareUpdating the TM-818, TM-828 & TM-838 FirmwareFirst, plug the USB drive into your computer. On the USB drive, create an empty folder called DeleteLicense (the name is case sensitive). Remove the USB drive from your computer. The "DeleteLiense" folder on the USB driveShut down your TimeMoto Clock, and plug in the USB drive. Restart, and wait until you see the main screen. The main screen is the screen that shows you date and time. Once you see the main screen, remove the USB drive from the TimeMoto Clock.You should now no longer see the “Authentication failure” message appear on your TimeMoto Clock’s screen. If you want to, you can remove the “DeleteLicense” folder from your USB drive.