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.
They provide a variety of free software for universal boards. You can browse their TP.VST59S collection for compatible PB802 dumps.
You can find the backup dump and firmware files on several community-driven platforms specializing in LED TV software. Recommended Download Sources
Another specialized repository that often carries backup dumps for universal and smart TV motherboards. Key Technical Details Board Model: TP.VST59S.PB802 Resolution: 1366 x 768 (HD)
Usually provided as a .bin file inside a .rar or .zip archive.