# \[Solved\]Is this flashing error normal? Atreus & Arduino IDE

**URL:** <https://community.keyboard.io/t/solved-is-this-flashing-error-normal-atreus-arduino-ide/4215>\
**Category:** Help and Getting Started\
**Created:** [October 10, 2020, 6:10am UTC](https://community.keyboard.io/t/solved-is-this-flashing-error-normal-atreus-arduino-ide/4215 "2020-10-10T06:10:32Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![juping](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.keyboard.io/juping/32/4938_2.png) [@juping](https://community.keyboard.io/u/juping)\
**Post date:** [October 10, 2020, 6:10am UTC](https://community.keyboard.io/t/solved-is-this-flashing-error-normal-atreus-arduino-ide/4215/1 "2020-10-10T06:10:32Z")

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In my quick review of the Atreus [here](https://community.keyboard.io/t/got-my-atreus-a-quick-review/4127) I mentioned being confused about the flashing procedure and ended up soft-bricking the device.

I seem to be able to flash the firmware with Chrysalis and edit the layers without much issue now, but on Arduino, despite holding down the bottom-left key through the entire flashing duration, I get the message:

> Arduino: 1.8.13 (Linux), Board: “Keyboardio Atreus”

> Sketch uses 21304 bytes (74%) of program storage space. Maximum is 28672 bytes.  
> Global variables use 919 bytes (35%) of dynamic memory, leaving 1641 bytes for local variables. Maximum is 2560 bytes.  
> An error occurred while uploading the sketch  
> avrdude: ser\_open(): can’t open device “/dev/ttyACM0”: Device or resource busy

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**Author:** ![algernon](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.keyboard.io/algernon/32/4404_2.png) [@algernon](https://community.keyboard.io/u/algernon)\
**Post date:** [October 10, 2020, 10:17am UTC](https://community.keyboard.io/t/solved-is-this-flashing-error-normal-atreus-arduino-ide/4215/2 "2020-10-10T10:17:00Z")

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Do you have something like ModemManager running? That can interfere with flashing (among other things)

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**Author:** ![juping](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.keyboard.io/juping/32/4938_2.png) [@juping](https://community.keyboard.io/u/juping)\
**Post date:** [October 10, 2020, 10:32am UTC](https://community.keyboard.io/t/solved-is-this-flashing-error-normal-atreus-arduino-ide/4215/3 "2020-10-10T10:32:19Z")

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That’s was it! Thanks for the solutions!