[LG Optimus L9 P760, P765, P768, P769] ncerni:
Hmm. I tried. Usually I get this:

23:02:27 : [C:\LGMobileUpgrade] Try to delete folder
23:02:27 : RemoveDirectory1 Error(2):C:\LGMobileUpgrade
23:02:27 : Start Date : 2013-05-27 23:02:27
23:02:27 : ---------- QM Testmode ---------
23:02:27 : ***** Check Tool Version *****
23:02:27 : Tool version : 1.5.4.8
23:02:27 : UpgradeDLL version : 1.2.6.7
23:02:27 : Current Dir : C:\ProgramData\LGMOBILEAX\B2C_Client
23:02:27 : LGE USB Driver Version :
23:02:27 : Android PDLV Version :
23:02:27 : Android NDLV Version :
23:02:27 : ******************************************
23:02:27 : [C:\ProgramData\LGMOBILEAX\Phone] Try to delete folder
23:02:27 : SetEmerModeAT()
23:02:27 : _IsConnectedPhone Call
23:02:50 : _IsConnectedPhone(2)
23:02:50 : 0 - NotConnected.
23:02:50 : 1 - Normal connect success
23:02:50 : 2 - Emergency connect success
23:02:50 : *****CheckOS Start********
23:02:50 : Microsoft_Windows7_Professional_Service Pack 1
23:02:50 : *****CheckPCSyncPrograms Start*****
23:02:50 : PCSyncPrograms Not Found - OK and ready to upgrade
23:02:50 : Checking the connection with the cell phone...
23:02:50 : dwWaitResetTime(40000 ms)
23:02:51 : Phone Mode(2)
23:02:51 : *****GetPhoneType Start*****
23:02:51 : Phone Type : OMAP_IFX
23:02:51 : *****GetPhoneBinaryVersion Start*****
23:02:51 : *****Get ESN / IMEI / MEID Start*****
23:02:51 : ESN/IMEI/MEID : +++++++++++++++++++++
23:02:51 : Phone type Compare start
23:02:51 : *****CheckPCSyncPrograms Start*****
23:02:52 : PCSyncPrograms Not Found - OK and ready to upgrade
23:02:53 : ****************CheckAndDownload********************
23:02:53 : ******Extract Start C:\Users\Nejc\Downloads\Desktop\v10a_00.kdz*****
23:02:53 : Model Dll Dir(C:\ProgramData\LGMOBILEAX\Phone\)
23:02:53 : File Size = 607291986
23:03:20 : Extract kdz file Success.
23:03:30 : Extracted C:\ProgramData\LGMOBILEAX\Phone\\V10A.wdb\n
23:03:31 : WDB(or DZ) FullPath(C:\ProgramData\LGMOBILEAX\Phone\\V10A.wdb)
23:03:40 : Extracted C:\ProgramData\LGMOBILEAX\Phone\\LGP760.dll\n
23:03:40 : Model dll FullPath(C:\ProgramData\LGMOBILEAX\Phone\\LGP760.dll)
23:03:40 : NNNNN WDB FullPath(C:\ProgramData\LGMOBILEAX\Phone\V10A.wdb)
23:03:40 : NNNNN Model dll FullPath(C:\ProgramData\LGMOBILEAX\Phone\LGP760.dll)
23:03:40 : Extract End C:\Users\Nejc\Downloads\Desktop\v10a_00.cab
23:03:40 : ------------------Model.dll Information-------------------
23:03:40 : Filename : LGP760.dll
23:03:40 : Version : 0.0.1.0
23:03:40 : File size : 270336
23:03:40 : File date : 2012/06/14-15:49:00
23:03:40 : PC Created date: 2013/05/27-23:03:31
23:03:40 : ----------------------------------------------------------
23:03:40 : *****Check LGCM Programs Start*****
23:03:40 : LGCM Programs Not Found - OK and ready to upgrade
23:03:40 : *****WorkModelDLL Start*****
23:03:40 : strPhoneBinaryPath(C:\ProgramData\LGMOBILEAX\Phone\V10A.wdb)
23:03:40 : strModuleDir(C:\ProgramData\LGMOBILEAX\Phone\)
23:03:40 : strModelDLLPath(C:\ProgramData\LGMOBILEAX\Phone\LGP760.dll)
23:03:40 : _DetachDLL Call
23:03:40 : _DetachDLL Call End
23:03:40 : Call fn_StartUpgrade
23:03:40 : ********* 2Chip Model.dll input Parameter*************
23:03:40 : MODEL_EVENT : 32769
23:03:40 : PhoneBinaryPath : C:\ProgramData\LGMOBILEAX\Phone\V10A.wdb
23:03:40 : ModuleDir : C:\ProgramData\LGMOBILEAX\Phone\
23:03:40 : BootWaitTime : 49500
23:03:40 : UsbHighSpeed : FALSE
23:03:40 : PhoneMode : 2
23:03:40 : NewPhoneBinVersion : v10a_00
23:03:40 : ClearSI : FALSE
23:03:40 : AuthMark : 0
23:03:40 : ********* 2Chip Model.dll input Parameter End*************
23:03:45 : wParam : 2004, lParam = 7
23:03:45 : Step : TYPE_WPARAM_IFX_DN_POS
23:03:45 : wParam : 2007, lParam = 0
23:03:45 : Step : TYPE_WPARAM_READ_FILES
23:03:45 : wParam : 2010, lParam = 3002
23:03:45 : CleanModelDll() : Free Model.dll
23:03:45 : _DetachDLL Call
23:03:45 : _DetachDLL Call End
23:03:45 : Page_Error şÎşĐŔÔ´Ď´Ů
23:03:45 : ż©±â´Â Retry şÎşĐŔÔ´Ď´Ů

First time I tried I got some "fatal error" stuff. but it was with V10G. Is the version of V10 important? Which one would you pick from here? http://xdaforums.com/showthread.php?t=2107971