Is the device a or a smart TV (L40Canvas) ?
To install this firmware via USB, you will need the SP Flash Tool and Micromax USB Drivers . Important Notes:
Finding specific parts of multi-part archives (like "part14.rar") for older firmware can be challenging as original hosting links often expire.
Instead of looking for part14.rar in isolation, search for the complete set. The firmware is likely labeled as Micromax 50 Canvas 3 Stock Firmware (Flash File) .
What is the found on the back of the device? Knowing this will help ensure you get the right firmware.