The (P75-338) is identical to your physical hardware.
The matches (located on a sticker inside the TV on the back of the LCD panel). Download P75 338 1920x1080 512M NORTH TECH 40SMS part4 rar
model using the TP.VST59.P75 (or similar P75 series) motherboard. Technical Specifications (often associated with the TP.VST59 chipset) Resolution: 1920 x 1080 (Full HD) RAM/Memory: 512M Brand/Model: NORTH TECH 40SMS Understanding the File Structure The (P75-338) is identical to your physical hardware
The search results indicate that is a firmware specification for LED/Smart TVs, specifically for the North Tech 40SMS specifically for the North Tech 40SMS