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  • I was hoping to be able to use the nRF52840 port on the Adafruit nRF52840 Feather (that uses the MDBT50Q module). I managed to successfully compile the .hex file using the attached board file that I based on a combination of the and files.

    I don't have the tiny SWD cable on hand, so I was hoping to just use Adafruit's bootloader. I generated a DFU package using

    adafruit-nrfutil dfu genpkg --dev-type 0x0052 --application espruino_2v09.134_nrf52840.hex

    and then successfully flashed it using

    adafruit-nrfutil --verbose dfu serial --package --port /dev/ttyACM0 -b 115200 --singlebank

    Unfortunately I can't connect to the board over BLE afterwards, and it also doesn't mount over USB. Any chance that this could work, or should I just bite the bullet and get a J-Link with the right cable?

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