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: Once the update reaches 100%, the TV usually restarts. Remove the USB drive immediately so it doesn't try to update again. Safety Tips Guide to Firmware Update | Lenovo US

Press and hold the button on the TV (not the remote) and plug the TV back in. Download 40b7500 715g6686 moa 001 004k BIN

Continue holding the power button until the screen shows an "Upgrading" or "Software Updating" progress bar. : Once the update reaches 100%, the TV usually restarts