Hello!!!
I downgraded my laptop HP Probook 4540s from widows 8 to windows 7 froffessional 64 bit
but I don't get the solution of unknown device
the Ids are:
IUSB3\ROOT_HUB30&VID_8086&PID_1E31&REV_0004&SID_17F6103C
IUSB3\ROOT_HUB30&VID_8086&PID_1E31&REV_0004
IUSB3\ROOT_HUB30&VID_8086&PID_1E31