Finally got serial ports working, win7 host, if you have "Failed to attach the USB device (E_INVALIDARG)" issues then try deleting this win7 registry key, fixed mine. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056 ...
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![virtualbox.org • View topic - [Solved] Wifislax and chipset Ralink RT3070](http://imagizer.imageshack.com/img924/2554/hjCnqb.png "virtualbox.org • View topic - [Solved] Wifislax and chipset Ralink RT3070")
virtualbox.org • View topic - [Solved] Wifislax and chipset Ralink RT3070
virtualbox.org • View topic - USB device is busy with a previous request
VirtualBox Failed to attach the USB device to the virtual machine
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![Failed to attach USB device [0100] : r/virtualbox](https://external-preview.redd.it/D-6KaACJFDxke46EHoq_nOXT91VZWI8GBIHIwUCwInI.png?width=640&crop=smart&auto=webp&s=2b2882c8b5103f1ea8ad04ef690c21cf14b2547c "Failed to attach USB device [0100] : r/virtualbox")
Failed to attach USB device [0100] : r/virtualbox
![VirtualBox not detecting USB in Windows 10/11 [Full Guide]](https://cdn.windowsreport.com/wp-content/uploads/2021/04/virtualbox-not-detecting-usb-windows-10.jpg "VirtualBox not detecting USB in Windows 10/11 [Full Guide]")
VirtualBox not detecting USB in Windows 10/11 [Full Guide]
VirtualBox Failed to attach the USB device to the virtual machine
