You cannot open "part05" by itself. You must have parts 01 through 05 (or however many exist in that set) for WinRAR or 7-Zip to merge them into the usable firmware.

A common source for TP.MT5507.PB801 software and similar universal board firmware.

Ensure your TV panel is actually 3840x2160 . Installing 4K firmware on a Full HD (1080p) panel can cause a blank screen or distorted images. Do you have the other parts of this file, or