Settings > Device Preferences > About > System Update.
If you manage to download the firmware (usually in .bin or .img format after extracting the RAR), the general installation steps are: Download ONIDA LEO43FIAB2 Software part01 rar
You will need all parts (part01, part02, etc.) in the same folder. Use a tool like WinRAR or 7-Zip to extract "part01.rar"; it will automatically pull from the other parts. Format USB: Use a FAT32 formatted USB drive. Settings > Device Preferences > About > System Update
Sites like LCD LED Solutions often host dump files (Bin/Binary files) for specific Onida models, including the 43-inch series. Format USB: Use a FAT32 formatted USB drive
Do you have the from inside the TV to ensure you get the exact matching file? Softwarezone.ga
Many technicians upload firmware links in the descriptions of repair videos. For instance, channels like Onida Stock Firmware provide links for various Onida Android device updates. How to Update via USB