A common source for Onida LED TV stock ROMs and USB update files.
Tech-focused YouTube channels often link to Google Drive or MediaFire mirrors for specific models like the LEO50FSAIN Download ONIDA LEO50FSAIN Software USB part08 rar
Move the firmware file directly to the root directory of your USB drive (do not put it inside a folder). Flashing the TV: Turn off the TV and unplug the power cord. Insert the USB drive into the USB 1 port. A common source for Onida LED TV stock
Use a tool like WinRAR to extract the .rar file. You should see a single .bin file or a folder containing the firmware. Download ONIDA LEO50FSAIN Software USB part08 rar
Plug the TV back in. In many Onida models, the update will start automatically (indicated by a blinking LED or progress bar).