I’m new to this so please let me know if I’m posting in the right place. I purchased the board a few weeks ago but decided to try it out today. I use an old iMac running El Capitan for Arduino projects whenever possible. I followed the driver installation in the hookup guide repeatedly, with no luck having the port recognized, so I gave up - this is not the real issue right now.
I thought I would have better luck with a Rasberry Pi 3B+ running Raspbian Buster, followed the instructions about apt-get update upgrade etc, etc. No luck finding the port in that Arduino IDE either.
So, I double clicked the reset button and OMG the Neopixel on the Redboard glowed a bright green! Sure enough, I then saw a mounted drive icon on my Pi desktop - CircuitPy. Double-click the reset again and the drive icon reads Metro4boot.
I don’t really understand bootloaders but I had tried to use an Adafruit Metro 4 Airlift Lite board with the Pi (and the iMac) earlier this year. It’s almost like my Pi is “infected” by that horrible product. I can always flash a new Buster image to the SD card but how do I get rid of it on the Redboard? Is it completely trashed?