Downgrade Error topic

I have an F320S which I want to downgrade from 20A to 11G, but when I try to install the 11G .kdz for my phone, LG Update Tool (or whatever it's called) stops at 2% when installing, and I get this message:

Quote:

21:48:33 : ********* 2Chip Model.dll input Parameter************* 21:48:33 : MODEL_EVENT : 32769 21:48:33 : PhoneBinaryPath : D:\Windows\Nedlastninger\KoreanSKT F320S F320S11G_00.kdz 21:48:33 : ModuleDir : C:\ProgramData\LGMOBILEAX\Phone\ 21:48:33 : BootWaitTime : 49500 21:48:33 : UsbHighSpeed : FALSE 21:48:33 : PhoneMode : 2 21:48:33 : NewPhoneBinVersion : KoreanSKT F320S F320S11G_00 21:48:33 : ClearSI : FALSE 21:48:33 : AuthMark : 0 21:48:33 : ********* 2Chip Model.dll input Parameter End************* 21:48:36 : wParam : 20, lParam = 540 21:48:36 : MODEL DLL Event : (20, 540) 21:48:37 : Model File Count = 540 21:48:37 : wParam : 100, lParam = 51 21:48:37 : MODEL DLL Event : (100, 51) 21:48:37 : Step : TYPE_WPARAM_UPGRADE_ERROR 21:48:37 : CleanModelDll() : Free Model.dll 21:48:37 : _DetachDLL Call 21:48:42 : _DetachDLL Call End 21:48:42 : Page_Error ºÎºÐÀÔ´Ï´Ù 21:48:42 : ¿©±â´Â Retry ºÎºÐÀÔ´Ï´Ù

Is it because I'm downgrading, and it recognizes that I have a newer ROM-version and won't let me downgrade, or what? It would be very nice if someone gave me a solution, which I couldn't find by searching. Thanks in advance :P