Ds9664nist Firmware: Updated
If your device displays the text physically on the casing (rather than just a typo in the search bar), you may possess a specialized OEM or government-contract specific unit. In this case, standard firmware from the Hikvision website will likely fail to install or brick the device. You would need to source firmware from the specific vendor that supplied the hardware.
Clear your browser cache or use an Incognito/Private window. New firmware often conflicts with old browser cookies. ds9664nist firmware updated