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Documentation > GR551x DFU Application Note/ Introduction Copy URL


Device Firmware Update (DFU) is a boot loading mechanism to update firmware for target devices, allowing developers to quickly fix defects and provide more functions for their products.

This document introduces the methods and principles of DFU for GR551x SoCs, and how to enable and test DFU functionalities.

Before getting started, you can refer to the following documents.

Table 1 Reference documents
Name Description

GR551x Developer Guide

Introduces the software/hardware and quick start guide of GR551x SoCs.

Bluetooth Core Spec

Offers official Bluetooth standards and core specification from Bluetooth SIG.

J-Link/J-Trace User Guide

Provides J-Link operational instructions. Available at

Keil User Guide

Offers detailed Keil operational instructions. Available at .

GR551x OTA Example Application

Introduces how to implement Over The Air (OTA) for GR551x firmware on GRToolbox (Android).

GR551x Bluetooth Low Energy Stack User Guide

Introduces the BLE Protocol Stack supported by GR551x SoCs.

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