yes i did, i could exchange files between the smartphone and the pc. This might be a prove, that the LG USB driver is installed correctly.
The windows device manager shows following entry: LGE Mobile USB Serial Port (COM3).
Please note, that according to the hardware info the Model number in the phone settings is specified as LG-H815TR. The former Model number of the defect motherboard was Model number LG-H815. (By the way, despite of different Model numbers "LG-H815" is printed on both motherboards).
Is it possible to install a kdz for Germany/Europe on a motherboard with LG-H815 imprint, which shows the Model number "LG-H815TR" as hardware info in the phone settings ?