To help point you to the correct download package, what is on your TV's back label? Knowing your specific panel model number (found printed on the back of the LCD glass panel inside the chassis) will also prevent screen distortion issues after flashing.
For the Tp.sk518d.pc821, legitimate software typically falls into three categories: Tp.sk518d.pc821 Software Download
Watch the standby indicator light. If it starts blinking slowly or rapidly without pressing buttons, the board has automatically detected the file. Step 5: Wait for the Flashing Process to Complete To help point you to the correct download