Press and hold the or OK button on the TV (not the remote) while plugging the power cord back in.
: Once the flashing stops or the TV restarts, remove the USB drive and verify the new software version in the settings menu.
: Copy the firmware file (often named upgrade_loader.pkg or similar) directly to the root directory of the USB drive—do not place it inside a folder. Flashing Process : Turn off the TV and unplug the power cord. Insert the USB drive into the TV's USB port.
). Official manufacturer websites for Prismapro or universal board developers like Realtek often do not host these legacy files directly, so technicians often rely on community repositories or specialized forums. Firmware Download Resources
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