RRD is the Acronym for Round Robin Database. RRD is a system to store and display time-series data (i.e. network bandwidth, machine-room temperature, server load average). It stores the data in a very compact way that will not expand over time, and it presents useful graphs by processing the data to enforce a certain data density. It can be used either via simple wrapper scripts (from shell or Perl) or via frontends that poll network devices and put a friendly user interface on it.
The "NHG47K" build is a common Android 7.1.2 image used for RK322x and RK3229 devices. However, flashing the wrong version for your specific Wi-Fi chip or board revision can result in no Wi-Fi or a "bricked" device.
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But for many users, a clean NHG47K flash is the most stable option.
Android 7.1.2 firmware with build number a common stock operating system for TV boxes powered by the Rockchip RK322x
This essay explores the technical landscape of the RK322x chipset series, specifically focusing on the Android 7.1 (Nougat) firmware, build