ChameleonUltra and ChameleonLite both support DFU Mode – Device Firmware Upgrade Mode. Based on NRF52840 chip, they can be operated with Both USB and bluetooth connection. Here’s a simple tutorial for upgrade th firmware of ChameleonUltra with only Bluetooth.
Install DFU App
nRF Device Firmware Update is a mobile app for updating nRF5 SDK firmware using Bluetooth Low Energy as a transport.
Download the latest
zip package of your ChameleonUltra or ChameleonLite.
- Enter the DFU Mode There are 2 ways to enter DFU Mode
Option 1: Connect ChameleonUltra in MTools Lite and click
Enter DFU Mode.
Option 2: Hold on Button B and plugin USB Cable. Once get in DFU Mode, you can see the two LEDs in the middle blinking alternately.
- Choose firmware file in DFU App.
- Select Bluetooth devces whose name starts with
Uploadbutton to upload and upgrade the frimware.
- Wait for 1 mins to click Button A to power on ChameleonUltra again.
dfu-app.zip – The firmware only includes application parts.
dfu-full.zip – The firmware includes both application and bootloader.
lite-dfu-app.zip depending on your devices.