Flashing the wrong firmware can "brick" your TV's mainboard. Ensure your board number ( MS638 ) and panel model match exactly before attempting to install. Do you have the other parts of this archive already, or

: There are several "TV Repair" or "Firmware" channels where technicians share these split archives.

: Most of these files are shared on specialized forums like Kazaner , Remont-AUD , or 4PDA . These sites often require "points" or a technical quiz to download, which is why people often search for direct links to individual parts. Where to Look

: The "REF55" likely refers to a 55-inch panel configuration. In the world of TV repair, using the wrong "REF" version can result in an inverted screen or a "solarized" picture, making this specific "Part 4" critical for a successful fix.

Finding specific firmware "parts" like this usually points to a few scenarios common in the TV repair community:

: High-resolution (4K/3840x2160) firmware files are often 1GB to 2GB. To bypass upload limits on free hosting sites, technicians split them into multiple .rar parts. You need all parts (Part 1, 2, 3, and 4) in the same folder to extract the final .pkg or .bin file.