You will find that Amcrest and Lorex have been hardcoding the units to not allow updates to Dahua firmware. No idea if this camera is one of them, but it is new enough it could be.
But you do not want 8MP on a 1/2.8" sensor. The 2MP version on the same size sensor will kick the 8MP version butt all night long...
I've been looking at 4k cameras lately and that research brought me to this thread for some reason. I've been very happy with my 5mp Amcrest cameras. I remember when 4k cams were first coming out, folks were saying 5mp units were better for night scenes. Guess that's still true somewhat?
The whole reason I was thinking of getting a 4k was to put up on my detached garage looking back at my house and back yard. The area is pretty well lit at night with dusk to dawn lights. House is 80-100ish feet from the garage. I put up a old no name 4mp I had in the parts bin just to see how it would look. I like the view of the back of the house and cars in the driveway, but it's not enough if I want to try to take a closer look and zoom in digitally in blueiris.
Sorry for the hijack. I probably should start a new thread just for this matter.