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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

For general Smart TV downloads, the SmartTech TV Download Center lists various 55-inch models, though you must match the exact build version. How to Use Multipart RAR Files

Official manufacturer links for this specific older model are often unavailable, so most users rely on technician forums and community archives:

Some technicians provide download links in the descriptions of YouTube tutorials. You can find general IRIS update guides on YouTube which sometimes link to external repositories for files like part06.rar.

You must have every part (e.g., part01 through part06) in the same folder.

Release the button when the "Software Updating" screen appears. during this process. Iris firmware update instructions - Streamit

Hold the button on the TV (not the remote) and plug the power cord back in.