Solved How Can I Restore Firmware Using Usb Port Only In Lg Ga6400 Lg Television

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My LG GA6400 3D google tv got stuck in the initial LG logo screen. nothing responses except power on and off. I’ve tried hard reset by pressing power+volume up+volume down, but that didn’t work. Now I am stuck in the LG logo screen. Can anyone help me how to fix it..??.

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