Unzip the .rar file on your computer to find the firmware file (usually named MERGE.bin or similar).

Do you have the of the TV this board is installed in?

Installing the incorrect firmware (e.g., the wrong resolution or panel voltage) can permanently "brick" your device or damage the LCD panel. Always verify the panel sticker matches the 1920x1080 resolution before proceeding.

Wait for the indicator light to flash rapidly, indicating the update is in progress. until it finishes.

Format a USB flash drive (8GB or smaller is recommended) to FAT32 .

Sites like Kazmi Elecom , Labone Inside , or Soft4Led frequently host archives for "S215" and "QT526C" boards.

Search for "S215 QT526C USB Upgrade Firmware" on community-driven firmware databases. Standard USB Installation Steps