Here’s a quick one for anybody with a legacy Nuvico HD-TVI security DVR, e.g.,model DT-E800. The iOS app stopped being updated in 2014 and doesn’t work with iOS versions 11 and later. My user was ready to ditch his perfectly functional DVR because of this.
Long story short, a little reverse engineering revealed that the Nuvico platform is identical to another DVR branded “Hikvision”. And Hikvision has a current app that is a drop-in replacement.