# Problem with Update Firmware ConBee 2

**URL:** <https://forum.phoscon.de/t/problem-with-update-firmware-conbee-2/3822>\
**Category:** General\
**Created:** [July 29, 2023, 12:03pm UTC](https://forum.phoscon.de/t/problem-with-update-firmware-conbee-2/3822 "2023-07-29T12:03:52Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![Smanar](https://forum.phoscon.de/user_avatar/forum.phoscon.de/smanar/32/60_2.png) [@Smanar](https://forum.phoscon.de/u/Smanar)\
**Post date:** [July 31, 2023, 3:15pm UTC](https://forum.phoscon.de/t/problem-with-update-firmware-conbee-2/3822/8 "2023-07-31T15:15:15Z")

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Yep for me it’s exactly this issue [Conbee II stopped working on RPi 4](https://forum.phoscon.de/t/conbee-ii-stopped-working-on-rpi-4/3757)

Make a try with adding `--dev=/dev/ttyACM0`

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_[View the full topic](https://forum.phoscon.de/t/problem-with-update-firmware-conbee-2/3822)._