[G2 Q&A, Help & Troubleshooting] hoffik33:
OK, right now I feel like I am totaly dumb and missing something really obvious.

Everytime is my phone at 0% but LG flash tool displays 4% and this TYPE_WPARAM_UPGRADE_ERROR pops up, always same error even with different settings.

22:55:14 : Start Date : 2015-05-19 22:55:14
22:55:14 : ---------- QM CSE Testmode ---------
22:55:14 : ---------- CSE mode ---------
22:55:14 : ***** Check Tool Version *****
22:55:14 : Tool version : 1.6.9.0
22:55:14 : UpgradeDLL version : 2.1.5.0
22:55:14 : Current Dir : C:\ProgramData\LGMOBILEAX\B2C_Client
22:55:14 : LGE USB Driver Version :
22:55:14 : Android PDLV Version :
22:55:14 : Android NDLV Version : 3.12.0.0
22:55:14 : ******************************************
22:55:14 : [C:\ProgramData\LGMOBILEAX\Phone] Try to delete folder
22:55:14 : RemoveDirectory1 Error(2):C:\ProgramData\LGMOBILEAX\Phone
22:55:14 : SetEmerModeAT()
22:55:14 : *****CheckOS Start********
22:55:14 : Microsoft_Windows7_Professional_Service Pack 1
22:55:14 : *****CheckPCSyncPrograms Start*****
22:55:15 : PCSyncPrograms Not Found - OK and ready to upgrade
22:55:15 : Verifying phone connection...
22:55:15 : dwWaitResetTime(40000 ms)
22:55:16 : _IsConnectedPhone Call
22:55:23 : _IsConnectedPhone(2)
22:55:23 : 0 - NotConnected.
22:55:23 : 1 - Normal connect success
22:55:23 : 2 - Emergency connect success
22:55:23 : Phone Mode(2)
22:55:27 : Skip Backup and Restore - CSE mode.
22:55:27 : *****CheckPCSyncPrograms Start*****
22:55:28 : PCSyncPrograms Not Found - OK and ready to upgrade
22:55:29 : ****************CheckAndDownload********************
22:55:29 : Version :
22:55:29 : ******Extract Start C:\Users\Dell\Downloads\D80220B_00.kdz*****
22:55:29 : Model Dll Dir(C:\ProgramData\LGMOBILEAX\Phone\)
22:55:29 : Check 2G-4G big size kdz file..
22:55:29 : Extract 2G-4G big size kdz file..
22:55:29 : NNNNN WDB FullPath(C:\Users\Dell\Downloads\D80220B_00.kdz)
22:55:29 : NNNNN Model dll FullPath(C:\ProgramData\LGMOBILEAX\Phone\LGUP_8974.dll)
22:55:29 : Extract End C:\Users\Dell\Downloads\D80220B_00.kdz
22:55:29 : 01 Skip delete kdz 1.1 file...
22:55:29 : ------------------Model.dll Information-------------------
22:55:29 : Filename : LGUP_8974.dll
22:55:29 : Version : 0.3.10.0
22:55:29 : File size : 1498624
22:55:29 : File date : 2015/05/19-22:55:29
22:55:29 : PC Created date: 2015/05/19-22:55:29
22:55:29 : ----------------------------------------------------------
22:55:29 : *****Check LGCM Programs Start*****
22:55:29 : LGCM Programs Not Found - OK and ready to upgrade
22:55:29 : m_pLGCyonUpdate status change.
22:55:29 : *****WorkModelDLL Start*****
22:55:29 : strPhoneBinaryPath(C:\Users\Dell\Downloads\D80220B_00.kdz)
22:55:29 : strModuleDir(C:\ProgramData\LGMOBILEAX\Phone\)
22:55:29 : strModelDLLPath(C:\ProgramData\LGMOBILEAX\Phone\LGUP_8974.dll)
22:55:29 : _DetachDLL Call
22:55:34 : _DetachDLL Call End
22:55:34 : Call fn_StartUpgrade
22:55:34 : Phone mode change -> CSE
22:55:34 : ********* CDMA Model.dll input Parameter *************
22:55:34 : MODEL_EVENT : 32769
22:55:34 : PhoneBinaryPath : C:\Users\Dell\Downloads\D80220B_00.kdz
22:55:34 : ModuleDir : C:\ProgramData\LGMOBILEAX\Phone\
22:55:34 : BootWaitTime : 49500
22:55:34 : UsbHighSpeed : FALSE
22:55:34 : PhoneMode : 4
22:55:34 : NewPhoneBinVersion : D80220B_00
22:55:34 : ClearSI : FALSE
22:55:34 : AuthMark : 0
22:55:34 : ********* CDMA Model.dll input Parameter End*************
22:55:55 : wParam : 100, lParam = 72
22:55:55 : MODEL DLL Event : (100, 72)
22:55:55 : Step : TYPE_WPARAM_UPGRADE_ERROR
22:55:55 : CleanModelDll() : Free Model.dll
22:55:55 : _DetachDLL Call
22:56:00 : _DetachDLL Call End
22:56:00 : Page_Error şÎşĐŔÔ´Ď´Ů
22:56:00 : ż©±â´Â Retry şÎşĐŔÔ´Ď´Ů

It doesn´t matter if I use LGFlashTool2014 or UpTestEX tool with windows enabler. Unfortunately i don´t have original LG cable anymore, but i tried to use 3 another different cables and 2 computers (laptop and desktop computer with usb port located on the mainboard - both running win7).

Any further ideas?