When using any of stlink commands, there's a lot of libusb debug messages obscuring everything else: LIBUSB_FUNCTION: libusb_submit_transfer enter LIBUSB_FUNCTION: libusb_submit_transfer leave 0 LIBUSB_FUNCTION: libusb_handle_events_timeout_completed enter LIBUSB_FUNCTION: libusb10_handle_events_sub enter LIBUSB_FUNCTION: libusb_handle_events_timeout_completed exit LIBUSB_FUNCTION: libusb_bulk_transfer leave LIBUSB_FUNCTION: libusb_bulk_transfer enter LIBUSB_FUNCTION: libusb_submit_transfer enter LIBUSB_FUNCTION: libusb_submit_transfer leave 0 LIBUSB_FUNCTION: libusb_handle_events_timeout_completed enter LIBUSB_FUNCTION: libusb10_handle_events_sub enter LIBUSB_FUNCTION: libusb_handle_events_timeout_completed exit LIBUSB_FUNCTION: libusb_bulk_transfer leave 21/ 35 pages writtenLIBUSB_FUNCTION: libusb_bulk_transfer enter LIBUSB_FUNCTION: libusb_submit_transfer enter LIBUSB_FUNCTION: libusb_submit_transfer leave 0 LIBUSB_FUNCTION: libusb_handle_events_timeout_completed enter LIBUSB_FUNCTION: libusb10_handle_events_sub enter LIBUSB_FUNCTION: libusb_handle_events_timeout_completed exit LIBUSB_FUNCTION: libusb_bulk_transfer leave LIBUSB_FUNCTION: libusb_bulk_transfer enter