While "VST" could refer to a proprietary board configuration, it closely mimics the naming conventions used by specific SoC families. For example, it may be a variant or a specific board identifier for an Allwinner series chip (such as the V3s or similar ARM-based processors) or a Rockwell-based board. This part of the name tells the flashing software: "Do not install this on a Rockchip device; this belongs to the VST53 architecture."
Here is a technical "piece" or overview of what this file is, its function, and how it is typically used in hardware repair and modification. vst53c-4mb-m.bin
Often found in 17-inch to 24-inch monitors or TVs that have been converted using universal driver boards like the for flashing this file onto your board? While "VST" could refer to a proprietary board