Multi-part RAR files are a single archive split into smaller pieces. You cannot use "Part 3" by itself; you must have in the same folder.
Right-click on and select "Extract Here" using WinRAR or 7-Zip . Download IRIS SAT 40E510S Firmware part3 rar
Copy the extracted firmware file (e.g., all_upgrade_v510.bin ) directly to the root directory of the USB. Do not put it inside a folder. Step 4: Installation Guide Turn off your IRIS SAT TV and unplug the power cord. Insert the USB drive into the TV's USB port. Multi-part RAR files are a single archive split
Plug the TV back in. Some models will detect the file and start flashing automatically. Download IRIS SAT 40E510S Firmware part3 rar