I’m running into the error when trying to upgrade the firmware and now when re-configuring the ZBT-1:
“The serial port is locked by another application”
However, I can’t find any other applications using /ttyUSB0
I’m running HA on a rpi3
You can’t upgrade the firmware while ZHA or Zigbee2MQTT is running. Disable them, then update firmware.
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I was able to solve this by reflashing the dongle using this: Home Assistant Connect ZBT-1