UMD 9000 series User Manual page 25

upgrade. After the upgrade is complete, suggesting that the upgrade is complete, the
system will automatically restart, and then you can pull out the U disk.
Note:
 The power supply can't be cut down during the system upgrade, unexpected
system crash caused by power outages due to man-made, please sent to the
original factory to be resolved;
 During the upgrade process, USB devices cannot be pulled out halfway; make
sure the upgrade file intact.
 Upgraded the previous version of version 1.0.2.3 to a later version, it will restart
twice, it's a normal phenomenon, do not unplug the U disk at the first restart.
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UMD NVR User Manual