You can upgrade device firmware via Hik-Connect, which is a cloud service.
> Basic Management > Device.
This field is not required if Hik-Partner Pro Protocol is selected as the device access protocol.
If you set the value to 5, up to 5 devices can be selected for batch upgrade.
If you select Local PC as the upgrade method, you should install the required web plug-in if the prompt pops up.
The upgradable devices will be displayed.
Select Upgrade Now from the Upgrade Schedule drop-down list to start upgrade.
Select Custom from the Upgrade Schedule drop-down list and then customize a time period to upgrade the selected device(s).
The upgrade task list will be open.