The board comes pre-programmed with a USB bootloader. You can develop programs for the nRF52840’s Cortex-M4 using either Arduino, Circuit Python, or C (using Nordic’s nRF5 SDK), and load that compiled code using a USB serial or mass-storage interface.
The bootloader that ships on this board is heavily based on Adafruit’s nRF52 Bootloader. This is an extremely well-designed UF2, CDC, and DFU bootloader that provides extensive bootloading support to Nordic’s nRF52 (nRF52840 and nRF52832) products.
The Adafruit Feather nRF52840 will be shipping soon we’ve previewed it a few times on our weekly show and Python on hardware newsletter (sign up!), we have some changes to the software and some final testing on the hardware we do first, expect it in the Adafruit store soon 🙂
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