Hello,
I succesfully installed el capitan (clover) on my probook 4540s, and use the probook installer, I replace the wifi card (put a bcm943224hms) and all is working except sound.
this is the info of my sound card (according to DPCImanager):
0x80861E20, 0x103C17F6, 0x111D76D9, 0x0107, IDT...