> For the complete documentation index, see [llms.txt](https://docs.mtoolstec.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mtoolstec.com/upgrade-the-firmware-of-chameleonultra-and-chameleonlite.md).

# Upgrade the firmware of ChameleonUltra and ChameleonLite

### DFU Tool for ChameleonUltra & ChameleonLite

<div align="left" data-full-width="false"><figure><img src="/files/0WtazCPYLJhDkKGXcytS" alt="" width="375"><figcaption></figcaption></figure></div>

### Steps

1. Connect the Chameleon device with the Bluetooth icon
2. Enter ChameleonUltra tool > GUI > Settings > Firmware Upgrade
3. Click ChameleonUltra or ChameleonLite to fetch the latest firmware
4. Click to choose **CU-XXXX** or **CL-XXXX** device
5. Click start to flash the firmware

### Video Tutorial

Upgrade firmware with MTools BLE App on MacOS.

{% embed url="<https://www.youtube.com/watch?v=fE0uT1NAFzA>" %}