Firmware files for this model are often large and may be split into multiple parts (like a "part03.rar") which must be extracted together into a single .bin or .img file before being placed on the root of your USB drive.
Select (or About , depending on your menu version). Choose About and then System Update . Download ONIDA LEO40FSAIN FHD Firmware part03 rar
These guides demonstrate how to navigate the settings for software updates on Onida and similar Android TVs: Firmware files for this model are often large
Connect the USB drive to the TV, go to Settings > Software Upgrade > USB Upgrade , and follow the on-screen instructions. and follow the on-screen instructions.