If you are missing Part 3, the archive will not open. Ensure you have the exact same file version for all parts.
Websites like KazmiElecom or Lab-One frequently host multi-part RAR files for TV mainboards. Installation Warning Download VST 6A338 PB818 SPARC USB part3 rar
Typically supports 1366x768 (HD) or 1920x1080 (FHD) depending on the specific software version. If you are missing Part 3, the archive will not open
Most updates are performed via USB by placing the .bin file on the root of a FAT32-formatted drive. Where to Find the Download If you are missing Part 3