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.
Community-driven platforms such as Kazmi Elecom or Softwarezone.ga are common sources for split RAR files like the "part01" you mentioned. Download ONIDA LEO43FIAB2 Software part01 rar
If you manage to download the firmware (usually in .bin or .img format after extracting the RAR), the general installation steps are: You will need all parts (part01, part02, etc
If your TV still boots, you can check for official updates through the menu: You will need all parts (part01
Settings > Device Preferences > About > System Update.
Official downloads for older Onida models are rarely hosted on a public consumer site. Technicians typically source these from specialized firmware marketplaces or community groups: