# \[Resolved\] MacOS Capitan 10.11.6 Photon Upload Fails

**URL:** <https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594>\
**Category:** Troubleshooting\
**Created:** [July 24, 2016, 7:49pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594 "2016-07-24T19:49:26Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Stevie](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@Stevie](https://community.particle.io/u/Stevie)\
**Post date:** [July 24, 2016, 7:49pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/1 "2016-07-24T19:49:26Z")

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Hi,

I have upgraded my Mac to the mentioned OS version. After that suddenly uploading via DFU to my Photons no longer works. Basically as soon as the Photon switches to DFU mode it will not be listed any longer under /dev/cu.usbmodem\*. Anyone else seen that? Any idea for fixing?

Thanks!

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**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\
**Post date:** [July 24, 2016, 7:58pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/2 "2016-07-24T19:58:33Z")

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I would reinstall dfu-util. If you previously installed it using homebrew, upgrade homebrew first. Same if you used MacPorts.

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**Author:** ![Stevie](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@Stevie](https://community.particle.io/u/Stevie)\
**Post date:** [July 24, 2016, 7:59pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/3 "2016-07-24T19:59:39Z")

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I could try that. But if the Photon is not even visible in /dev/cu.usbmodem\* I think that would not help.

Thanks, Stevei

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**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\
**Post date:** [July 24, 2016, 8:00pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/4 "2016-07-24T20:00:07Z")

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The problem is that you lost the DFU device driver, reinstalling dfu-util will put it back.

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<div class="post-metadata">

**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\
**Post date:** [July 24, 2016, 8:04pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/5 "2016-07-24T20:04:05Z")

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Also, a Photon or Electron in DFU mode doesn’t normally show up with a /dev/cu.usbmodem\* entry. It only shows up in normal operating mode or listening mode as a cu device.

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**Author:** ![Stevie](https://avatars.discourse-cdn.com/v4/letter/s/74df32/32.png) [@Stevie](https://community.particle.io/u/Stevie)\
**Post date:** [July 24, 2016, 8:11pm UTC](https://community.particle.io/t/resolved-macos-capitan-10-11-6-photon-upload-fails/24594/6 "2016-07-24T20:11:24Z")

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Thanks for the suggestion. I upgraded brew, reinstalled dfu-util and it is working again. Weird. Anyway, thanks a lot!