Thanks JB1970. I've downloaded this firmware as well to try on my I-Series DS-7608NI-I2 NVR. TL;DR --- It works... sort of!
This is the first update I've done in about 3 years. The previous version was V4.22.005 build 191208. Like most people I find it convenient to operate it remotely via a browser rather than hook up a monitor and mouse to the unit in a 19" rack under the stairs!
I'm one of those weirdos that uses Ubuntu for everything and Firefox is my browser of choice . All was going reasonably well until I upgraded to Ubuntu 20.10 a few days ago and that upgraded Firefox to 93.0 (64bit). When I tried accessing the NVR I could no longer get any video at all either from the live view or playback.
I checked the console ouput from Firefox and noticed the browser was in a lot of pain! There were API calls being attempted that had been deprecated and I think the pages break the more strict
CORS protocol too!
So rather than delve into the reasons it no longer worked I decided to upgrade in the faint hope it would solve the problem.
After upgrading to V4.51.025 I initially ran into the scary issue of not being able to login! Luckily I had read around and noted that
this issue had come up before. The solution is to clear the cookie cache (and the local storage and the indexed DB and the local storage and the session storage!). Once I could login I went straight to the live view and.... still no video... bah!
Long story short on my desktop Ubuntu system I have to resort to using Chrome instead of Firefox... oh well