: Ensure your USB drive is formatted to FAT32. Lenovo and other manufacturers warn that using the wrong format or an interrupted update can "brick" the device.
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: Copy the 40b7500_715g6686_moa_001_004k.bin file directly to the root of the USB drive. Do not put it in a folder. Installation : Unplug the TV from the power outlet. Insert the USB drive into the TV's USB port. : Ensure your USB drive is formatted to FAT32
Continue holding the power button until the screen shows an "Upgrading" or "Software Updating" progress bar. Download 40b7500 715g6686 moa 001 004k BIN