If your TV is working fine, There is no benefit. However, if you are swapping the board into a new panel or experiencing "Solarization" (distorted colors), a firmware flash is a necessary and effective tool. It turns a piece of "e-waste" into a functional display for less than ₹1,500.
The platform is aging. Before investing hours in finding a firmware update, consider this: t.sk105a.03 firmware update
Contact support at [support email/link] with your device model and current firmware version. If your TV is working fine, There is no benefit