While holding down the Power button on the TV (not the remote), plug the power cord back into the wall.

Open your .rar package and extract the firmware file (usually ending in .bin or .pkg ) directly to the root directory of your USB drive. Do not put it in a folder.

If the image appears distorted after flashing, you may have used a 1080p firmware version instead of the required 3840x2160 build.

Release the button once you see an "Upgrading" or "Software Updating" progress bar on the screen. Do not turn off the power during this time, as it could permanently damage the mainboard.

The correct (often labeled as MS638_PC822_Aconatic_49DSU800_part1.rar ). WinRAR or 7-Zip to extract the .rar package. Step-by-Step Installation Guide

Plug the drive into one of the USB ports on the side or back of the TV.

Ensuring the board is correctly flashed for 3840x2160 (4K) resolution to maintain peak picture quality. Pre-Installation Checklist Before you begin, ensure you have: A USB drive (at least 1GB to 4GB) formatted to FAT32 .

stuck on the logo screen or acting sluggish? Often, these issues stem from corrupted system software on the MS638 PC822