Typically done via USB (insert drive and power on) or using a programmer like the RT809F via the VGA ISP port. Download TP.VST59S.PB801 All software for free - Facebook
They provide a variety of free software for universal boards. You can browse their TP.VST59S collection for compatible PB802 dumps.
This channel frequently hosts dump files for China-made universal boards. You can check their archive for TP.VST59S.PB802 firmware or specific 1366x768 BIN files.
Usually provided as a .bin file inside a .rar or .zip archive.