What is a .DFU file?
DFU is a Device Firmware Upgrade image, used to flash chips like the STM32 over USB.
- Did you know
- DFU is a standard way to update a device’s firmware straight over USB.
- DFU is a USB Implementers Forum device class, letting a chip be reflashed using the same USB port it normally runs on.
- STMicroelectronics extended it as “DfuSe”, the format its STM32 microcontroller bootloaders accept over USB.
- What Analyser reads
- Identify and read more disk images, firmware and VM files: TRX router firmware, USB DFU images, UEFI/BIOS flash volumes (.fd/.rom), Linux UBI volumes, Android sparse images (.simg), U-Boot FIT (.itb), raw floppy images (.dsk/.ima/.vfd with FAT boot sector), VMware snapshot metadata and NVRAM, Parallels VMs and disks (.pvm/.hdd), OVF manifests (.mf) and Veeam backups (.vbk).
- Depth of analysis
- .DFU is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .DFU file
- Drag a .DFU file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.