You must download all parts (Part 1, Part 2... through Part 12) into the same folder before extracting.
Place the extracted .bin or .img file into the root directory (not inside any folder) of the USB. Download MICROMAX L40CANVAS Firmware USB part12 rar
The TV should show an "Upgrading" or "Software Updating" screen. Do not turn off the power during this process. You must download all parts (Part 1, Part 2
Large firmware files are often split into smaller "Parts" (e.g., Part 1 to Part 12) for easier uploading and downloading on file-sharing sites. .rar (Requires WinRAR or 7-Zip to extract). Download MICROMAX L40CANVAS Firmware USB part12 rar
With the TV off, insert the USB into the TV's service/USB port.