Since direct links often break, search these reputable technician platforms for "L40CD500 firmware":
Often hosts multi-part RAR files for Micromax models. Soft4Led : A global database for TV board firmware. Common Installation Steps Download Micromax L40CD500 Software part1 rar
A common repository for tested LED TV software. Since direct links often break, search these reputable
Note the model number on the sticker of the LCD/LED panel itself. Since direct links often break