cant flash tot d851 motherboard in a d855

Hi guys i have a d855 g3 with a d851 motherbord and am stuck in download mode whene i try to flash the d855 tot file lg flashtool gives me an erorr " partition change " because the mother board is a d851 and whene i try to flash it with the d851 tot files its gives me an erorr " model changed d855 to d851 " guys plz help i dont know what to do ....!!!!

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