On most devices (e.g., Blackview, Ulefone, Doogee, and Chinese tablets), the diag port is multiplexed over USB in CDC DM (Communication Device Class – Diagnostic Mode) or ADB + DM composite configuration.
: A system reboot is often required to fully register the new virtual COM ports. sprd u25 diag driver work
: Bypassing Factory Reset Protection on newer Android versions (including Android 15). On most devices (e