DFU-dat

To enter Device Firmware Update (DFU) mode, use one of the following three methods depending on your bootloader:

1. Physical Button (Standard)

  • Action: Hold the Reset button (or Button 1) while powering on or plugging in the USB.
  • Result: A slow pulsing/breathing LED indicator.

2. Double-Tap Reset (Adafruit/Arduino)

  • Action: Quickly press the Reset button twice (within 0.5s).
  • Result: The device appears as a USB drive named NRF52BOOT.

3. Software Trigger (BLE)

  • Action: Connect via the nRF Connect app.
  • Command: Locate the Secure DFU Service and write 01 to the Control Point characteristic to jump to the bootloader.

ref

Table of Contents

https://www.electrodragon.com