Datasheet

DFU Bluefruit Updates

For videos on the latest update procedure using Bluefruit LE Connect see:

iOS: https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-friend/dfu-

on-ios

Android: https://learn.adafruit.com/introducing-adafruit-ble-bluetooth-low-energy-

friend/dfu-on-android-4-dot-3-plus

You can reprogram the Bluefruit LE module itself over-the-air using an Android or iOS

phone/tablet. This doesn't reprogram the ATmega32u4 in the Bluefruit Micro, only the BLE

module itself. Since its not a common thing to do, its a little challenging to do.

You will need to disconnect/unpower the Bluefruit Micro, connect a wire temporarily

between the DFU pin and GND and then power up the board via USB or battery.

The red LED will blink continuously, letting you know it's in DFU mode. Then follow our guide

for field updating the firmware

The video below is out of date and applies to early versions of the board before

the Bluefruit LE Connect apps were available for iOS, Android and OS X in the

respective app stores. To keep your device up to date, simply install and open the

Bluefruit LE Connect app and connect to your Bluefruit device. If a firmware update

is available, it will be automatically proposed, and the entire update process will be

handled transparently for you.