Fix hackrf_open() failed: HackRF not found (-5)
pi@raspberrypi:~ $ hackrf_spiflash -w ~/Downloads/hackrf-2021.03.1/firmware-bin/hackrf_one_usb.bin File size 35444 bytes. hackrf_open() failed: HackRF not found (-5) Solution Use sudo before the command: pi@raspberrypi:~ $ sudo hackrf_spiflash -w ~/Downloads/hackrf-2021.03.1/firmware-bin/hackrf_one_usb.bin File size 35444 bytes. Erasing SPI flash....
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