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Driver worked well in Win 7 until I updated to Win 10. I didn't do a clean install of Windows 10, just an upgrade from 7 to 10. Plugged in a fresh Pico and saw the red light flash. I opened up the web IDE tried the normal way to connect and it said Connect failed. I tried a restart but same thing. So I checked Device manager and noticed.

Try other Eltima solutions

• Serial to Ethernet Connector Access remote serial port over Internet connection.
• Serial Port Monitor Monitor and debug your serial port. Log its data flow for testing
• Serial Splitter Share and split serial port data flows.

I had similar issue with a slightly different wording - it is possible to connect to the device until it's reset. My custom board would enumerate VCP correctly but would not connect after device reset. Turns out, that USB host keeps the enumerated address for the device, while device looses its address after reset/reprogramming.

To avoid such issues, software reset should also perform USB physical layer reset (disconnecting pullup on D+/D- pin, depending on the speed used). In such a case it should be possible to connect to the device after disabling and then re-enabling it in the device manager or re-plugging.

Not Necessarilly the answer but may be worth checking.If your periodically send information out of the COM port and it appears your program does ( never used STM32 ), Windows (hyperterm so I assume windows XP) can detect that as a serial mouse and enumerates it as a mouse thus opening the port and preventing any other application from using it.We have had many issues with this with our devices (CP2103's from SiLabs), and also is a common problem with GPS recievers.This answer as a good description of the issue and possible workarrounds.

Wago io check update download. The open source software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.