# Cannot open DFU Device error

**URL:** <https://crucible.hubbe.net/t/cannot-open-dfu-device-error/3195>\
**Category:** ProffieOS\
**Created:** [April 5, 2023, 6:49pm UTC](https://crucible.hubbe.net/t/cannot-open-dfu-device-error/3195 "2023-04-05T18:49:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Snowshadow2003](https://crucible.hubbe.net/letter_avatar_proxy/v4/letter/s/4bbf92/32.png) [@Snowshadow2003](https://crucible.hubbe.net/u/Snowshadow2003)\
**Post date:** [April 5, 2023, 6:49pm UTC](https://crucible.hubbe.net/t/cannot-open-dfu-device-error/3195/1 "2023-04-05T18:49:04Z")

</div>

I got this error message when trying to upload my config file to my lightsaber, any advice?

```auto
c:/users/aidan/appdata/local/arduino15/packages/proffieboard/tools/arm-none-eabi-gcc/9-2020-q2-update/bin/../lib/gcc/arm-none-eabi/9.3.1/../../../../arm-none-eabi/bin/ld.exe:C:\Users\Aidan\AppData\Local\Arduino15\packages\proffieboard\hardware\stm32l4\3.6\variants\STM32L433CC-ProffieboardV2/linker_scripts/STM32L433CC_FLASH.ld:224: warning: memory region `SRAM2' not declared
Sketch uses 237064 bytes (90%) of program storage space. Maximum is 262144 bytes.
Cannot open DFU device 0483:df11
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Cannot open DFU device 0483:df11

```

---

<div class="post-metadata">

**Author:** ![profezzorn](https://crucible.hubbe.net/user_avatar/crucible.hubbe.net/profezzorn/32/8_2.png) [@profezzorn](https://crucible.hubbe.net/u/profezzorn)\
**Post date:** [April 5, 2023, 6:58pm UTC](https://crucible.hubbe.net/t/cannot-open-dfu-device-error/3195/2 "2023-04-05T18:58:32Z")

</div>

Run `proffie-dfu-setup.exe`

Instructions and download links can be found here:

> **[Proffieboard Setup](https://pod.hubbe.net/proffieboard-setup.html#windows)**
>
> Documentation for ProffieOS