Opening a DFU File

The DFU file type is primarily associated with dfu-util.

DFU	File extension: DFU
	File type:	device firmware upgrade

What is a DFU file?

DFU files mostly belong to dfu-util by dfu-util Maintainers. A DFU file is a Universal Serial Bus (USB) device driver saved in the format defined by the USB Device Firmware Upgrade Standard. Hardware manufacturers and projects such as STMicroelectronics as well as Openmoko and OpenPCD projects have implemented device DFU device upgrade formats for their USB devices. dfu-util is a cross-platform desktop application for flashing a DFU firmware upgrade to supported devices.

How do you open DFU files?

You need a suitable software like dfu-util to open a DFU file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your DFU file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a DFU file directly in the browser:. Just drag the file onto this browser window and drop it.

Online DFU Text Viewer

Choose your .dfu file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert DFU files:

dfu-util by dfu-util Maintainers
See the previous paragraphs to learn more about the main application. DFU files are often referred to as dfu-util systems because this type of file is primarily created or used by this software.
DfuSe (device firmware update) by DfuSe Developers
DfuSe is a program for downloading and installing the firmware of an STM32 microcontroller unit. Such device firmware upgrades are saved in a DFU file. This file format is classified as System.
iPhone (device firmware update) by Apple
The iPhone is a series of smartphones manufactured and marketed by Apple. An iPhone's firmware upgrade is distributed as a DFU file. This file format is classified as System.

Technical Data for DFU File Extension

File classification:

System

Related files:

duf, zip, upg, swi

Mime type:

application/octet-stream

a dfu device firmware upgrade is a special file format by dfu-util Maintainers and should only be edited and saved with the appropriate software.

How to solve problems with DFU files

Associate the DFU file extension with the correct application.
Update your software that should actually open device firmware upgrades. Because only the current version supports the latest DFU file format. Search, therefore, e.g. on the dfu-util Maintainers manufacturer website after an available dfu-util update.
To make sure that your DFU file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .DFU file online - secure, fast, and no downloads needed.