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content/Software Support/Upload/avrdude-ser-open-cant-set-com-state-for-COMn.md

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title: "avrdude: ser_open(): can't set com-state for COMn"
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title: avrdude: ser_open(): can't set com-state for COMn
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id: 13148652511260
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An "`avrdude: ser_open(): can't set com-state for COMn`" error can occur when uploading to the boards that use specific batches of the [WCH CH340 USB chip](http://www.wch-ic.com/products/CH340.html). The problem only occurs when using the latest version of the CH340 driver, and can be solved by installing a previous release.

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