Download the latest Hikvision firmware by visiting the Hikvision Downloads Page
2) Extract the firmware archive, it should contain the file: digicap.dav
3) Create a tunnel to your Hikvision device
4) Login to your Hikvision device and navigate to Config -> Maintenance
5) Scroll to the bottom of the page next to the 'Upgrade' header.
6) Click the Browse button at the right-hand side
7) Browse to and select the digicap.dav file
8) Click 'Upgrade'
For more additional information, here is a video from Hikvision Technical Support.