> 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

MTools BLE provides a super easy DFU Tool for the firmware of ChameleonUltra and ChameleonLite from official repository or custom repository.

### DFU Tool for ChameleonUltra & ChameleonLite

<div align="left" data-full-width="false"><figure><img src="https://3395533350-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LD97pa04tZLvlPyG5f6-887967055%2Fuploads%2FjSpIHjQVrg3qB4y9WEwr%2FChameleonUltra%20DFU.png?alt=media&amp;token=cb5a9ab4-2ca8-4f78-8df2-bdc355c116be" 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>" %}