Dahua Technology TFTP upgrade instructor - Manual (Page 10)

F、Restart the DVR, and that’s all
6）Upgrade Failure
1、To check if the RS232 serial port and serial cable is OK
2、To check if the network connection is OK
3、To check if the mac address of the DVR is right
4、To check if the upgrade software is in the right folder and with right name
5、To check if the NCOM and TFTP software is running
6、Upgrade by TFTP upgrade again
7、After several times attempt, if there is still have problems, please contact with our
technical engineers.
Attention: Do not use run da to upgrade if not necessary
Never do anything that will stop upgrade run da
More Details
If you still have any problems about these functions, please contact with our engineers.