LG G3 D851 stocked in HS-USB 9008 after installing D855 KDZ 6.0

I'm unable to enter download mode or turn on the phone after after installing D855 firmware in ma d851, my computer recognizes it as a Qualcomm HS-USB QDLoader 9008 without short circuiting. I tried the BoardDiag method, but I get "Failed during loading flash programmer".
And when I use LG Flash Tool I get "Model Information Check Fail!"
I really need help!:eek:

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