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since I can't load the firmware with dahua toolbox I would like to know the procedure to load the firmware through the serial port.

hi Kemar, I have a serious problem. I can't load the sip 2.0 update on my vto3211d. 50% happens and it works fails. They advised me to update it via the serial port. I saw that you used the serial to assist. I need the connection diagram and I need to know if I have to select the 232 serial...