Hi and apologies for dragging up this thread yet again :o
I'm helping my father out with his DS-7604N (rather than NI) that I now realise was running a cracked version of the firmware.
The unit suffered a hard disk failure (it's got to be about 13 or so years old) so I decided to take it away...
I know I'm late to the party but I've just upgraded m DS-7608NI-E2 to v3.4.0 and I'm impressed so far :) I especially like the fact I can still login and access the NVR config even if the plug-in isn't installed on the browser.