To find the official stock firmware and the specific missing parts, you can check these community-trusted databases:
: Download and extract the SP Flash Tool (Smartphone Flash Tool). How to Flash the Firmware via USB Download MICROMAX L40CANVAS Firmware USB part20 rar
: Install the MediaTek USB VCOM Drivers on your PC so it can recognize your device in "Download Mode". To find the official stock firmware and the
: Download every numbered .rar part (Part 1 through Part 20+). Place them in the same folder and extract only the first part ; the extraction tool will automatically combine the rest. Download MICROMAX L40CANVAS Firmware USB part20 rar