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@@ -128,3 +128,9 @@ Common Errors and Known Issues
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- The reason for ``No DFU capable USB device available`` could be that the USB driver wasn't properly installed on Windows (see :ref:`api_guide_dfu_flash_win`), udev rule was not setup on Linux (see :ref:`api_guide_dfu_flash_udev`) or the device isn't in bootloader mode.
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- Flashing with ``dfu-util`` on Windows fails on the first attempt with error ``Lost device after RESET?``. Please retry the flashing and it should succeed the next time.
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+Secure Download Mode
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+------------------------------
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+- When Secure Download Mode is enabled, DFU is no longer possible. See: :doc:`Flash Encryption <../security/flash-encryption>`
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Chip Weinberger