An updated version of my #24 video.
The video shows Pine64 Ox64 Single Board Computer. It also covers the basics of installing the firmware, loading, and booting Linux os.
Pico firmware to support two serial ports is here:
https://github.com/KrisSekula/Pine64...
Flashing Instructions:
https://github.com/openbouffalo/build...
Flashing software:
https://dev.bouffalolab.com/download
Other useful software:
https://www.balena.io/etcher
https://www.7zip.org/