Create dfu-util-errors-when-uploading-exit-status-74.md

Author: seaxwi

content/Software Support/Upload/dfu-util-errors-when-uploading-exit-status-74.md

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+---
+title: "dfu-util errors when uploading (exit status 74)"
+---
+
+Many Arduino boards use the **dfu-util** utility to upload sketches to the board. Some of these include:
+
+* Arduion UNO R4 Minima
+* Arduino GIGA R1 WiFi
+
+In this article:
+
+* [`Failed uploading: uploading error: exit status 74`](#exit-status-74)
+* [`dfu-util: No DFU capable USB device available`](#no-dfu-capable-usb-device-available)
+* [`dfu-util: Cannot open DFU device {vid}:{pid} found on devnum {n} (LIBUSB_ERROR_ACCESS)`](#libusb-error-access)
+* [`dfu-util: More than one DFU capable USB device found!`](#more-than-one-dfu-capable-usb-device)
+* [`Warning: Invalid DFU suffix signature`](#invalid-dfu-suffix-signature)
+
+---
+
+<a id="exit-status-74"></a>
+
+## `Failed uploading: uploading error: exit status 74`
+
+When an upload fails, you may see the message `Failed uploading: uploading error: exit status 74`. This is a generic message indicating that the upload process has failed. The exit status code (47) is used by the dfu-util upload utility.
+
+<!-- Whenever an upload fails, this message may appear at the end of the console output. -->
+
+---
+
+<a id="no-dfu-capable-usb-device-available"></a>
+
+## `dfu-util: No DFU capable USB device available`
+
+This message indicates that no USB devices supporting the DFU upload protocol were found by dfu-util.
+
+Follow these steps:
+
+1. Make sure you have the right board selected in the board selector, or the **Tools > Board** menu. If you're unsure about which board you should use, see [Select board and port in Arduino IDE](https://support.arduino.cc/hc/en-us/articles/4406856349970-Select-board-and-port-in-Arduino-IDE).
+
+2. Make sure the device you're using is properly connected with a working USB data cable. Try using a different USB cable, and avoid using USB hubs if possible.
+
+---
+
+<a id="libusb-error-access"></a>
+
+## `dfu-util: Cannot open DFU device {vid}:{pid} found on devnum {n} (LIBUSB_ERROR_ACCESS)`
+
+The message varies depending on the board.
+
+On Linux, this error can be caused by missing udev rules. This is more likely to be the cause if the error the first time you're uploading from the system.
+
+   <a class="link-chevron-right">Fix udev rules on Linux</a>
+
+---
+
+<a id="more-than-one-dfu-capable-usb-device"></a>
+
+## `dfu-util: More than one DFU capable USB device found!`
+
+When uploading a sketch, you may see this error:
+
+```
+dfu-util: More than one DFU capable USB device found! Try `--list' and specify the serial number or disconnect all but one device
+```
+
+To resolve the error, disconnect any extra boards or dfu capable devices you have connected to your computer.
+
+> **Note:** The port selection is not considered when dfu-util is used for uploading the sketch.
+
+---
+
+<a id="invalid-dfu-suffix-signature"></a>
+
+## `Warning: Invalid DFU suffix signature` <!-- TODO -->
+
+When uploading a sketch to you may receive this warning in the console:
+
+```
+Warning: Invalid DFU suffix signature
+A valid DFU suffix will be required in a future dfu-util release
+```
+
+This warning is expected, and does not indicate a problem. The warning is only displayed if [verbose output is enabled](https://support.arduino.cc/hc/en-us/articles/4407705216274) in Preferences. If no other warnings or errors appears in the output, the sketch was most likely uploaded successfully.
+
+<!-- markdownlint-disable-file HC001 -->