Default Optimus G band flashing

Hello! I need to get new motherboard to my phone, is this possible to get LS970/E973 or some other to work with typical Polish GSM network? Its hard to get cheap european E975 with broken screen or smth to get motherboard from it. My repairer said that he have tools called Vygis and LGTool, is it possibile? I don't want to waste money..

Help really appreciated.