- Windows 10
- Windows 8.1
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- Device manufacturers of CDC Control devices
Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.
- Improved PnP and power management by the driver (such as, handling surprise removal).
- Added power management features such as USB Selective Suspend.
In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.
Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.
In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.
- If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
- If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
- If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.
Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.
Windows 8.1 and earlier versions
In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.
The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.
For more information, see this KB article.
Configure selective suspend for Usbser.sys
Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:
To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:
'0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
'0x00000000': Enters selective suspend only when there are no open handles to the device.
That entry can be added in one of two ways:
Write an INF that references the install INF and add the registry entry in the HW.AddReg section.
Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.
For more information, see Microsoft OS Descriptors.
Develop Windows applications for a USB CDC device
If you install Usbser.sys for the USB CDC device, here are the application programming model options:
Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.
In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:
Win32 programming model:
.NET framework programming model:
If you are trying to update to the Windows 10 November 2019 Update (Windows 10, version 1909), the Windows 10 May 2019 Feature Update (Windows 10, version 1903), or the Windows 10 October 2018 Update (Windows 10, version 1809), you may encounter an update compatibility hold and receive the message, 'Qualcomm wifi driver: Your PC has a driver that isn't ready for this version of Windows 10. A new version is available.'
Windows 10, version 1909 and Windows 10, version 1903:
Windows 10, version 1809:
Microsoft has identified compatibility issues with some driver versions for certain Qualcomm Wi-Fi adapters. Devices with affected driver versions might experience loss of Wi-Fi connectivity after updating to a newer version of Windows 10.
Drivers Wis Usb Devices Wireless Adapter
To safeguard your upgrade experience, we have applied a hold on devices with affected Qualcomm driver from being offered Windows 10, version 1809, Windows 10, version 1903, or Windows 10, version 1909, until the updated driver is installed.
You should first try manually checking for updates. For instructions, see Update Windows 10. If you are offered Qualcomm Wi-fi drivers and they install successfully, then you should now be able to update to Windows 10, version 1903. Select Check for Updates again, it should be offered and install as expected.
If you are not offered the driver from Windows Update, we recommend you try the following steps:
Select Start or the search box in the task bar.
type 'device manager' and open Device Manager.
Within Device Manager, find Network adapters and expand it to see all the currently installed adapters.
Right-click or long press on the Qualcomm adapter and select Update driver.
Select Search automatically for updated drivers on the dialog that opens.
Wait for it to complete the task. If it says, 'The best driver for your device are already installed.' then the driver was not updated. If the driver was updated, you should now be able to Check for Updates and install the newer version of Windows 10.
Install Usb Driver
If you are not offered drivers for your affected Qualcomm Wi-fi adapter using either method above, you can follow the steps below to install an updated Wi-Fi driver:
Download the Qualcomm Wi-fi adapter drivers to your preferred folder: DriverNote We recommend downloading them to your Documents folder.
Open File Explorer. If there is no file explorer icon in the task bar, select the search box and enter file explorer and select it.
Within File Explorer, go the Documents folder or the folder you downloaded the drivers to.
Find and double click or double tap on the file named qcamainext10x-4-0-3-262-msx64_19fcb71525109fd2831d5a40944ded5663ec6af1.cab
Select CTRL+a on the keyboard. This should select all of the files.
Right click or long press on any of the files.
A warning dialog might open with the text, 'Windows Security: Opening these files might be harmful to your computer. Your internet security settings blocked one or more files from being opened. Do you want to open these files anyway?' If you see this warning, select the OK button.
Select Extract from the right-click menu.
Select the New folder button and rename it Qualcomm Wi-fi driver.
Select the Extract button.
In the search box on the taskbar, enter device manager, then select Device Manager.
Find Network adapters and expand it.
Find the device with Qualcomm Wireless Network Adapter or Killer Wireless Network Adapter in the name and right-click or long press on it.
Select Update Driver from the context menu.
Select the Browse my computer for driver software button.
It should default to your Documents folder, if this is where you saved the drivers then just select the Next button. If you did not save the drivers to your Documents folder, select the Browse button and find the folder you downloaded the drivers to and select OK.
It should now find the updated drivers and install them. Wait for this to complete and select Close.
After you have updated your Qualcomm Wi-Fi adapter drivers, the safeguard hold should be removed and you should be able to install the newer version of Windows 10.
Note We recommend that you do not attempt to manually update using the Update now button or the Media Creation Tool until a new driver has been installed and the Windows 10, version 1903 or Windows 10, version 1909 feature update has been automatically offered to you.