: Use an archive utility like WinRAR or WinZip. Right-click only the first file (part1.rar) and select "Extract Here" or "Extract to [folder name]."

: The software will automatically pull data from part 2, part 3, and part 4 to rebuild the full original file (usually an .upg or .bin file). How to update the software of Philips TV via USB?

If you have already downloaded a multi-part archive (e.g., part1.rar to part4.rar) from another source: