Arduino IDE Burn Bootloader menu option will pick the correct bootloader binary for your selected board and prevent any command typos or other common errors.

Close the Serial Monitor before you click "Burn Bootloader". Afterwards, you shouldn't close the Arduino IDE, unplug the board, launch Serial Monitor etc ... to abort the process. There is a high chance it will brick your device! Do this with care and caution.

First select the correct board you are using under Tools -> Board

Then select "Bootloader DFU for Bluefruit nRF52" for Tools->Programmer

Double check all of the following: Board, Programmer...

Then select Tools->Burn Bootloader to start the upgrade.

After receiving the new Bootloader over the serial connection, the old Bootloader will erase itself! The new bootloader will then be flashed. The process typically takes 30-60 seconds to complete. Make sure you see the "Device programmed" in the output log before launching Serial monitor or uploadinga new sketch.

Upgrading target on /dev/ttyACM0 with DFU package /Adafruit_nRF52_Arduino/bootloader/feather_nrf52840_express/feather_nrf52840_express_bootloader-0.6.2_s140_6.1.1.zip. Flow control is disabled, Dual bank, Touch 1200
Touched serial port /dev/ttyACM0
Opened serial port /dev/ttyACM0
Starting DFU upgrade of type 3, SoftDevice size: 151016, bootloader size: 39000, application size: 0
Sending DFU start packet
Sending DFU init packet
Sending firmware file
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Activating new firmware

DFU upgrade took 20.50154972076416s
Device programmed.

The drawbacks is the bundled bootloader may not be the latest one and you will need to install Arduino IDE. Check out the next page for more advanced command line version

This guide was first published on Jan 02, 2019. It was last updated on 2022-01-14 01:15:52 -0500.

This page (Use Arduino IDE) was last updated on Jan 24, 2022.

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