OK, so what is the mystery header on the Strix B550-F? It's the small 9 pin header (actually 14 but with 5 pins removed) which is located next to the CHA_FAN1, AIO_Pump and bios chip? The pinout is arranged like a USB port, but the pins are too small. The pins are the same size as those used by the thunderbolt header.
Also, what is the COM_Debug for?
