Cheap DVR teardown and pinout (MVPower, Hi3520D_v1.95p)

I have recently purchased a no-name CCTV kit which was very inexpensive, especially considering the functionality.
DVR Front MVPOWER TM

Mine is branded MVPower CCTV DVR Model TV-7108HE, P/N:UKEX39534 HD CCTV H.264 video equipment.
DVR Bottom MVPOWER CCTV DVR MODEL TV-7108HE INPUT DC 12V System PAL P N UKEX39534
It comes with or without video cameras and with or without a hard drive. I chose the 4 camera, no hard drive option. You may have chosen some other combination.

Working on the back panel first, mine has 8 video in, 1 video out, 1 HD output, 1 audio in, 1 audio out, 1 VGA out, 1 net (ethernet, RJ45), 2 USB ports, 1 RS485 port, 1 DC12v power port, 1 power switch.
DVR Rear Video In DVR Rear VGA DVR Rear Net USB RS485 DC12V DVR Rear Alarm DVR Rear Audio
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