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Posted : admin | On 17-08-2021

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Article credit goes to: ifamilysoftware.com
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Purpose of this article is to guide you on how to FIX the 'Prolific USB-to-Serial' driver issue with common cheap units.

In summary, this article is for: Windows XP, Windows 7, Windows 8, Windows 8.1 and Windows 10. Works on 32/64-bit.

And it addresses issue of: Prolific PL-2303 Driver Fix (VID_067B&PID_2303)

Driver issue will show inside your Device Manager like this:


(Notice in above picture, yellow triangle next to 'Prolific USB-to-Serial Comm Port (COM X)'. That means correct driver version is not installed.)

And if you double-click on it, you will see:

(Notice in above picture, Code 10 error. This confirms you need to install correct driver file.)

Issue will also may show messages like this:

  • 'This Device cannot start (Code 10)'
  • 'No driver installed for this device'
  • 'Device driver was not successfully installed'

Available forum solutions to this problem are half-baked. Even vendors selling their 'USB to Serial' adapters are baffled.

Main cause of this issue is because the device you own contains a counterfeit 'Prolific' chip (China clone).

The counterfeit chip use the same Vendor ID (VID_067B) and Product ID (PID_2303) - as the authentic Prolific chips.

To solve this intellectual infringement - original Prolific company modified their newest drivers to render the counterfeit adapters unusable. Unfortunately this decision also renders all earlier adapters inoperative.

The Prolific 64-bit drivers that Microsoft supplies via Windows Update, Versions 3.4.67.325, 3.4.25.218, 2.1.51.238 and 3.4.62.293 - will not work with most adapters and therefore shows the generic 'Code 10' error.

Or you may get no error at all, but your device will still not work.

If your adapter was working prior to going to Windows Update, you can 'roll back' to the previous installed driver and all will be well once again.

However if you didn't have a previous driver installed that worked - you'll have to go through the process of removing any PL-2303 driver installation programs, the actual driver files, and the information (.INF) file, BEFORE you are able to successfully install the correct driver.

(What worsens this issue is that there are many 'Prolific Driver Removal Tools' that do not work properly.)

And Windows 8, 8.1 and Window 10 are set by default to automatically update your drivers without your permission or even notifying you of the update.

So no matter how many times you remove the driver files and reboot - the next time you insert the USB-To-Serial adapter, Windows installs the newest non-working version again.

Only 64-bit driver I have ever found that works with all the 'Prolific' adapters is Version 3.3.2.102.

Below installer program will remove all of the incompatible drivers — make a change so that Windows can never update the driver without your approval — and install the Version 3.3.2.102 compatible drivers.

  • All Windows 64-bit operating systems including Windows 10
  • Prolific USB to Serial Adapter .
  • Device using PL-2303 H/HXA/HX/X version chips
  • Driver Version: 3.3.2.102
  • Driver Date: 09/29/08
  • Supported device ID and product strings: . VID_067B&PID_2303 for 'Prolific USB-to-Serial Comm Port'

Steps:

  1. Download and save the 'PL2303_64bit_ Installer.exe' by clicking here.
  2. Unplug all USB-To-Serial adapters from your computer - and double-click on 'PL2303_64bit_Installer.exe'
  3. When it prompts you, plug in one (1) of your USB-To-Serial adapters and click 'Continue'.
  4. Reboot your computer. That's it!

Troubleshooting:

You must follow ever step in the process in exact order.

  1. If you still receive an error after running the PL-2303_64bit_Installer.exe and your device is plugged in - go to Windows Device Manager.
    • Windows Vista/7/8/10: Control Panel » System » Device Manager
    • Windows XP: Control Panel » System » 'Hardware' tab » Device Manager
  2. Scroll down to Ports (Com & LPT) and double-click on 'Prolific USB-to-Serial Comm Port (COM#)'.
  3. In the Properties Window, Click on 'Driver'.

The 'Driver Version' must say '3.3.2.102' dated 09/24/08.

If not, then the correct driver is not installed.
Unplug the USB-To-Serial adapter and run the 'PL2303_64bit_Installer.exe' again - following the directions precisely until the correct driver appears.

Windows 32-bit Fix:
  • All Windows 32-bit operating systems from XP up
  • Prolific USB to Serial Adapter .
  • Device using PL-2303 H/HXA/HX/X version chips
  • Driver Version: 2.0.2.8
  • Driver Date: 11/20/07
  • Supported device ID and product strings: . VID_067B&PID_2303 for 'Prolific USB-to-Serial Comm Port'

Steps:

  1. Download and Save the 'PL-2303_Driver_ Installer.exe' by clicking here.
  2. Run the installer program. If it offers a choice to remove the driver, then select to remove the current 'bad' driver.
    Then run the installer again to install the correct driver.

Troubleshooting:

  1. If you still receive an error after running the PL-2303_Driver_Installer.exe and your device is plugged in, go to the Windows Device Manager.
    • Windows Vista/7/8/10: Control Panel » System » Device Manager
    • Windows XP: Control Panel » System » 'Hardware' tab » Device Manager
  2. Scroll down to Ports (Com & LPT) and double-click on 'Prolific USB-to-Serial Comm Port (COM#)'.
  3. In the Properties Window, Click on 'Driver'.

The 'Driver Version' must say '2.0.2.8' dated 11/20/07.

If not, then the correct driver is not installed. Unplug the USB-To-Serial adapter and run the 'PL2303_Driver_Installer.exe' again, following the directions until correct driver appears in Device Manager.

Removal of this tool:

The Prolific 32-bit PL-2303_Driver_Installer is a 'Program' file and therefore installed to your computer and must stay. If you want to delete it - use the Windows 'Uninstall a Program' or 'Add or Remove Program' feature - however this will also uninstall the driver itself.

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Key words: Sabrent, SBT-USC1M, Prolific, PL-2303, PL2303, USB to Serial, VID_067B, PID_2303, Code 10

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Versions supported

  • Windows 10
  • Windows 8.1

Applies to

  • 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.

Usbser.sys installation

Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.

Note

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.

Windows 10

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.

USBClass_02

USBClass_02&SubClass_02

  • 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.

Note

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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 How to use or reference the Usbser.sys driver from universal serial bus (USB) modem .inf files.

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Configure selective suspend for Usbser.sys

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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

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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:

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