New! M5Paper Now In UIFlow. Check it out!

I have looked around a bit on the website, but I have questions about using serial on the ATOM Matrix. How many serial ports are available? What pins correspond the port(s)? Is the USB C overlapping the serial port? Thanks!

Good day.
I have spent a little while searching the forums before posting this question. Can you please advise how I can restore the factory demo firmware on the M5StickC after I flash UIFlow firmware and load other programs. I hate to depart from the starting point, without knowing how to get back. Thanks in advance.