How it works...

Traditionally, special software has had to be installed and used to handle the delicate process of flashing a microcontroller. Microsoft developed the UF2 method, which greatly simplifies the process by not requiring any special software or command-line execution to flash the microcontroller.

Once the board is placed into the bootloader mode, it will then expect a UF2 file to be saved to it. When the UF2 is copied to the drive, the microcontroller will detect that the file copy has been completed and then automatically proceed to flash the microcontroller and restart the device, at which point the device is reattached and ready to be used.