Eh, but I tried before, MP choose 921600bps, and SERIAL0_BAUD remain 115200bps it would not connect through the USB cable.
I change SERIAL0_BAUd to 921600 it connects and but log files cannot download.
I try this, of course, hoping I can achieve faster speed log file transfer, especially for a big one. The result is visually I did not experience 500 - 600Kbytes/sec.