I understand the firmware situation. I was lucky I didn't brick my DVR.
Video Server E is what came with this DVR, although, I am able to use Video Viewer, too.
I first came here because my DVR suddenly stopped emailing motion alert pictures. It was working one day, then it just stopped. No matter how much I tweaked the sensitivity and re-apply the email settings, I'm still not able to get these motion alerts coming.
Gruffydog