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Hard-bricked LG G3 D858HK

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Nov 11, 2016
Will you please, please help me! :(

It seems I've hard-bricked my LG G3 D858HK Dual Sim 4G LTE 32GB. It wasn't updating the firmware (only found out 3 weeks after warranty expired). So, successfully flashed the ROM to Marshmellow 6.0, then tried to root it with (mistakenly) wrong firmware - lollipop app/tool.

Problems: black screen, won't boot (red & blue light flashing), won't go into download mode, computer not recognising phone/USB is plugged into - even with right drivers installed.