If you are missing "part06.rar," the firmware update will not work. To use these files:

The model refers to a 55-inch LED TV, and seeking a specific "part06.rar" file typically indicates you are trying to reconstruct a large firmware update that was split into multiple compressed volumes. Important: Verify the Mainboard First

Copy the extracted file to a FAT32-formatted USB drive. General USB Update Procedure Once you have the full file: Turn off the TV and unplug it. Insert the USB drive into the USB 2.0 port.

Before downloading, you must confirm the firmware matches your TV's (usually printed on the green PCB inside the TV, e.g., TP.MS338.PC821 or similar). Installing the wrong firmware can permanently "brick" your device. Common Sources for IRIS TV Firmware