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Mention dfu-util permissions in README

Clara Hobbs 4 years ago
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@@ -102,6 +102,10 @@ firmware can then be flashed with:
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     $ dfu-util -a 0 -s 0x08000000:leave -D build/pd-buddy-firmware.bin
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+If this fails with a message like "dfu-util: Cannot open DFU device 0483:df11",
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+it's likely that you don't have permissions to write to the device.  Try
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+running dfu-util as root if this is the case.
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+
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 If applicable, don't forget to set the switch back to normal mode (or remove
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 the solder blob) after unplugging the device.
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