The exact process varies by TV model, but most Videocon MT5507 boards follow this USB upgrade method:
Firmware for smart TVs is often very large and split into multiple parts (e.g., part01.rar to part08.rar) to make uploading and downloading easier. Download MT5507 3840x2160 Videocon part08 rar
until the process hits 100% and the TV reboots! The exact process varies by TV model, but