Could you provide the of your Kogan device? I can then help you locate the official firmware or manual.
Be cautious when downloading .rar files from third-party forums or "warez" sites, as these are not verified by the manufacturer and may contain malware or corrupted data that could brick your device if used as firmware.
: The nomenclature "3840x2160" strongly suggests it is a 4K resolution file. Multi-part ".rar" files (part01, part02, etc.) are common in community forums for sharing high-bitrate video samples used to test TV panel quality.
The specific file appears to be a segment of a multi-part archive, likely containing a 4K video sample or a large firmware update for a Kogan television or monitor.