1) The power supply may be unstable, please try to replace the socket interface, power adapter or power cord. If the power supply still fails to start after replacing the power supply, please contact the seller for after-sales service
  2) If the device fails to start after the online upgrade failure, please contact the technician to provide the upgrade package for manual upgrade. If the manual upgrade fails or after upgraded still cannot start, please contact the seller for after-sales service

  Related link: Manual upgrade tutorial