must match the firmware to your specific TV model number and screen size (e.g., 50K321UW) rather than just the board number. Official Support : Visit the Hisense Firmware Support Page or your local Hisense regional site. Manual Request : If the site doesn't list your older model, you can Email Hisense Support model number and serial number to receive a direct download link. Hisense-USA 2. Preparing the USB Drive : Use a USB stick between 4GB and 32GB , formatted to File Placement : Extract the downloaded file. Locate the main firmware file, usually named upgrade_loader.pkg MstarUpgrade.bin ForceUpgrade.bin : Place the file directly in the root directory (not inside any folders). Do