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How to upgrade the firmware. The dfu-utils package on Ubuntu and similar distributions is installed by typing: sudo apt install dfu-utilsThe HFDY SDR uses 1.10c firmware whereas the Russian-made DSP-2 uses the latest official 2.10D firmware.The HFDY SDR uses 1.10c firmware whereas the Russian-made DSP-2 uses the latest official 2.10D firmware. Users have successfully flashed the latest Russian firmware on the Chinese HFDY unit. Caution! It is risky to flash the firmware as a failure in the flash process could render the device completely unusable without a recovery option. How to upgrade the firmware. The dfu-utils package on Ubuntu and similar distributions is installed by typing: sudo apt install dfu-utils