Can't get routed Android 6.0 (30D) and cant get back to lollipop D851

I have the latest version of android 6.0 my phone is D851
cant root it ( tried kingroot but didnt work )
cant get back to lollipop ( tried tot méthode but I get pid:null imei:null and the flash dont start ..... tried LGUP but it shows model unknown )
Try the kdz method with LG flash tool 2014 but the only version that can be flashed is the 6.0
the lollipop version shows error and dont start flashing
this is the log when try to flash the 20E version :
********* CDMA Model.dll input Parameter End*************
16:47:28 : wParam : 20, lParam = 540
16:47:28 : MODEL DLL Event : (20, 540)
16:47:28 : Model File Count = 540
16:47:28 : wParam : 6010, lParam = 0
16:47:28 : MODEL DLL Event : (6010, 0)
16:47:28 : Model Dll Msg Not Found(6010, 0)
16:47:33 : wParam : 100, lParam = 16777482
16:47:33 : MODEL DLL Event : (100, 16777482)
16:47:33 : Step : TYPE_WPARAM_UPGRADE_ERROR
16:47:33 : CleanModelDll() : Free Model.dll
16:47:33 : _DetachDLL Call
16:47:38 : _DetachDLL Call End
16:47:38 : Internet Connect fail..Offline upgrade....
16:47:38 : Page_Error ؛خ؛ذہش´د´ظ
16:47:38 : ؟©±â´آ Retry ؛خ؛ذہش´د´ظ
Please help

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