You cannot use "Part 12" by itself; it is just one piece of the whole software package. Use a tool like WinRAR or 7-Zip.
Once the blinking stops or the TV restarts, remove the USB drive. Download Micromax L32 CANVAS Software part12 rar
Move the extracted .bin file to the root of the USB (not inside any folder). Prepare TV: Turn the TV off and unplug the power cord. Insert USB: Plug the drive into the TV's USB port. You cannot use "Part 12" by itself; it