Use a FAT32 formatted USB drive (ideally 4GB or 8GB).
The "Mirror" firmware specifically corrects image orientation issues. 📥 Where to Download Download VST59S PC815 720MA 1366x768 Mirror rar
A well-known resource for LED TV software often hosts TP.VST59S.PC815 firmware files . Use a FAT32 formatted USB drive (ideally 4GB or 8GB)