To help you find the exact file, could you check the inside the TV for the Panel Model Number (e.g., V320BJ3)? Also, is the TV currently stuck on a boot logo or a black screen ?
Firmware is tied to the specific LCD/LED panel model (e.g., V390HJ1). Installing the wrong version can cause an upside-down image, incorrect colors, or a "black screen" bricked state. Download SIS231 P83 FITCO FLED FHD Mirror Firmware USB rar
The firmware you are looking for is specific to the (also known as TP.SIS231.P83 To help you find the exact file, could