The exact process varies by TV model, but most Videocon MT5507 boards follow this USB upgrade method:
The file is a specific split archive volume of a firmware file for a Videocon 4K Ultra HD television [1, 2]. Download MT5507 3840x2160 Videocon part08 rar
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. The exact process varies by TV model, but
Press and on the physical TV cabinet (not the remote). Download MT5507 3840x2160 Videocon part08 rar