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Continue holding the power button until the screen shows an "Upgrading" or "Software Updating" progress bar.

: 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. Download 40b7500 715g6686 moa 001 004k BIN

: 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. Continue holding the power button until the screen

What happens if a firmware update fails? If a firmware update fails, your device may become unresponsive or stop working entirely. Best Practices for Applying Firmware Updates - Quadbridge Installation : Unplug the TV from the power outlet

Press and hold the button on the TV (not the remote) and plug the TV back in.