Stuck at Firmware Update. Flashtool stuck at 6%

I had rooted KitKat on G3. So i tried to unroot it and go back to stock using Lgflash tool. During the process, lgflashtool is now stuck at 6% saying "change partition fail". In device manager ,my PC detects it as "LGE Mobille USB serial Port".
I have tried ADB .but it always show no device.

Please help me. :crying:




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