Pi Pico not Mounting in Bootsel Mode

When working with the Pi Pico, I ran into this issue and spent too long debugging. This is what worked for me:

1. Go into Device Manager
2. Under the COM ports, find RPI Interface 0
3. Right click and choose Update Driver
4. Then search manually and find USB Mass Storage
5. and that’s it! It should recognize the Pico now as a mass storage device.

Consider setting up a Picoprobe for easier breakpoint debugging too: https://github.com/raspberrypi/picoprobe