: Ensure you have every segment (Part 1, Part 2, etc.) in the same folder on your computer.
: Plug the USB drive into the TV's USB port while it is powered off.
: A reliable source for the specific "ELEKTA" or "Samsung" remote-compatible 1920x1080 USB updates. Download MS338 PB801 1920x1080 Samsung part5 rar
: Power on the TV. The indicator light should begin blinking, signaling that the software is installing automatically.
Since you mentioned "part5 rar," you are dealing with a split archive. To assemble it: : Ensure you have every segment (Part 1, Part 2, etc
: Right-click on Part 1 only and select "Extract Here" (using WinRAR or 7-Zip). The software will automatically pull data from all other parts to create one single allupgrade_msd338_4G_sos.bin (or similar) file.
Are you experiencing a specific error like a or a "1% stuck" progress bar during extraction or installation? : Power on the TV
To obtain the firmware, you will likely need to download all parts of a multi-part archive (e.g., part 1 through part 5) and extract them together to get the final .bin file. Recommended Download Sources