Since your file is "part09," you must have (part01 through part08) in the same folder to successfully extract the final firmware file.

: Use a tool like WinRAR or 7-Zip to open part01 ; it will automatically pull data from the other parts to recreate the full image.

: For many 4K devices, firmware is updated by placing the .bin or extracted file on a FAT32 formatted USB drive and booting the device into update mode.