DFU

DFU refers to the process of upgrading device firmware. The SDK supports:

• OTA via Bluetooth.

• CFU via USB HID or BR/EDR HID.

The functions of DFU include:

1. Fixing bugs or vulnerabilities in the device.

2. Adding new features or improving existing ones.

3. Optimizing device performance.

4. Updating device security to protect against new threats.

For more information about OTA and CFU, please refer to the following documents:

• OTA
• CFU

In the process of upgrading, if a failure occurs, you can identify potential causes by reviewing the error prompts provided by the tool. Here are some common steps and methods to help diagnose the reasons for upgrade failure:

1. Review Error Messages:

   Check the error messages provided by the upgrade tool. These messages usually indicate specific issues, such as missing files, version mismatches, or disconnection.

2. Check Log Files:

   View the upgrade tool’s log files. These files often offer more detailed error information, which can help with further analysis.

3. Verify Compatibility:

   Ensure that the current version and the target upgrade version are compatible, and make sure your system can accept this version upgrade.