OKI B432, MB472 and MB492 not detected via USB in Windows 11: how to install the PCL6 driver

Last Updated on 11.08.2026 by DriverNew

When an OKI B432, MB472 or MB492 is connected via USB, Windows 11 may fail to create a printer icon, display the status “Driver is unavailable”, or add a queue named OKI LTD xxx using the Microsoft IPP Class Driver. In the latter case, the computer has already detected the device, but it selected the generic IPP method instead of the official OKI PCL6 driver.

This situation has become particularly relevant in newer Windows 11 builds, where Windows Ready Print may be used by default for newly detected printers. For a basic home printer, this may sometimes be sufficient, but higher-end models may lose tray settings, duplex printing, paper sizes and other features. To restore them, you need to assign the correct PCL6 driver for the specific model.

Which models this guide applies to

This guide is intended for two groups of devices that use shared PCL6 packages.

This article applies to print installation on a standard x64 computer. For a laptop with an ARM processor or Windows 11 in S mode, the procedure is different and is described separately below.

Determine exactly what happened when the printer was connected

1. Open Settings.
2. Go to Bluetooth & devices > Printers & scanners.
3. Check whether a new print queue appeared after connecting the USB cable.
4. If a queue is present, open it and click Printer properties.
5. On the Advanced tab, check the value in the Driver field.

If the Printer properties button is not displayed, press Win + R, enter shell:PrintersFolder and press Enter. Right-click the required queue and select Printer properties. Do not confuse this command with the regular Properties item, which displays device information but does not allow you to replace the driver or port.

Step 1. Check the computer type and Windows mode

The standard OKI PCL6 package and modern Windows Ready Print are not interchangeable solutions for every computer. First determine the system architecture.

1. Open Settings > System > About.
2. Find System type.
3. If it shows 64-bit operating system, x64-based processor, continue with the PCL6 installation described in this article.
4. If it shows an ARM-based processor, do not install the standard x86/x64 package as the primary driver.
5. To check S mode, open Settings > System > Activation and check the Windows edition name.

If the computer uses ARM or Windows 11 in S mode

For monochrome OKI printers and MFPs in this configuration, use OKI PCL6 Class Driver 2 or an available Windows Ready Print queue. Installation is performed through Settings > Bluetooth & devices > Printers & scanners > Add device.

The Class Driver provides basic printing functions, but the selection of paper sizes and advanced settings may be more limited than with the official driver for a specific model. The standard EXE package described in the following sections is intended primarily for Windows x64.

Step 2. Update Windows 11

1. Disconnect the printer’s USB cable.
2. Open Settings > Windows Update.
3. Click Check for updates.
4. Install the available cumulative update and required fixes.
5. Restart the computer.
6. Check for updates again and make sure there is no message indicating that a restart is required.

Updating is especially important if Windows creates an IPP queue, print jobs disappear, or the printer starts outputting diagnostic text. Reinstalling the driver on a system that has not been updated may not correct Windows behavior itself.

Step 3. Check Windows Ready Print and protected print mode

Windows 11 uses two settings with similar names but different functions.

How to find these settings

1. Open Settings > Bluetooth & devices > Printers & scanners.
2. Scroll down to the printer settings section.
3. If the Default install printers using Windows Ready Print switch is present, turn it off temporarily while reinstalling PCL6.
4. If Windows protected print mode is enabled, click Turn Off and confirm.
5. Restart the computer before installing the OKI driver.

On a work computer, protected print mode may be enabled by the organization’s administrator. In this case, the user cannot disable it independently. Assistance from the system administrator or printing through the permitted Windows Ready Print method will be required.

Step 4. If Windows created an OKI LTD xxx queue

You do not necessarily need to delete the OKI LTD xxx queue. Install the PCL6 package and then replace the Microsoft IPP Class Driver assigned to it.

First install the required package

1. Download the file that corresponds to your model.
2. Run the EXE file and confirm the User Account Control prompt.
3. Select the installer language and accept the license agreement.
4. Select your model and the USB connection connection type.
5. If the installer asks you to connect the printer, connect it directly with a USB cable and turn it on.
6. If the installer only offers to install the driver without creating a new queue, complete the installation and do not delete the existing OKI LTD queue.

Assign the PCL6 driver to the existing queue

1. Open Settings > Bluetooth & devices > Printers & scanners.
2. Click OKI LTD xxx.
3. Open Printer properties.
4. Go to the Advanced tab.
5. In the Driver field, select the exact model, for example OKI B432(PCL6), OKI MB472(PCL6) or OKI MB492(PCL6).
6. Click Apply.
7. Open the Device Options tab.
8. Click Get Printer Information so the driver can retrieve information about trays and installed options.
9. Click Apply again.
10. On the General tab, click Print Test Page.

If the required model is not listed among the drivers, the package has not yet been installed. Close the properties window, run the appropriate EXE file again and complete the installation. Do not select a similar model simply because it is available in the list.

Step 5. Perform a clean installation of the PCL6 driver

Use this method if no icon appears, “Driver is unavailable” is displayed, the queue is corrupted, or switching from Microsoft IPP did not help.

Remove incorrect queues

1. Turn off the printer and disconnect the USB cable.
2. Open Settings > Bluetooth & devices > Printers & scanners.
3. Remove the OKI LTD xxx queue if it cannot be switched to PCL6.
4. Remove duplicate queues for your model marked Copy.
5. Do not remove a working OKI network queue or other printers.
6. Restart the computer.

Procedure for B412, B432, B512, ES4132 and ES5112

1. Use a USB 2.0 cable no longer than 5 m; a length of 2 m or less is preferred.
2. Connect the cable directly to a USB port on the computer.
3. Turn on the printer and wait until it reaches the ready state.
4. Run OKW3X0551113_309305.exe.
5. Confirm the User Account Control prompt.
6. Select the language, accept the agreement and select USB connection.
7. Select the exact model of the detected printer.
8. Install the PCL6 driver and perform the suggested test print.
9. If the current installer version asks you to disconnect the cable first, follow the message displayed on its screen and connect the device only when prompted.

Procedure for MB472, MB492, MB562 and related ES MFPs

1. Leave the MFP turned off and do not connect the USB cable.
2. Run OKW3X055114_254754.exe.
3. Confirm the User Account Control prompt.
4. Select the language and accept the license agreement.
5. Select the exact MFP model.
6. Select USB connection.
7. Start the PCL6 driver installation.
8. When the connection prompt appears on the screen, connect the MFP to the computer’s USB port and turn it on.
9. Wait for the device to be detected and complete the installation.
10. Restart the computer and print a test page.

Step 6. Check the created queue

1. Open Settings > Bluetooth & devices > Printers & scanners.
2. Select the installed OKI model.
3. Open Printer properties.
4. On the Advanced tab, make sure the driver for the exact model with the (PCL6) designation is selected.
5. On the Ports tab, find the row with the selected check box. With a USB connection, this is usually a virtual USB port such as USB001.
6. Do not manually change the port number to USB001 if your model is already shown next to another USB port: when several printers are connected, the port may be USB002 or USB003.
7. On the General tab, click Print Test Page.

If the test page prints but a specific application does not detect the new printer, close that application completely and open it again. Some applications read the printer list only when they start.

Step 7. If the installer does not find the printer

Check the cable and connection sequence

1. Disconnect the USB cable.
2. Wait at least five seconds before reconnecting it.
3. Connect the printer directly to the computer without using a docking station, monitor, switch or external USB hub.
4. Try another USB port on the computer.
5. If possible, use another known-good USB 2.0 cable that is 2 m or shorter.
6. Make sure the printer has fully started and that there are no paper, cover or consumable errors on the control panel.

Check whether Windows responds when the printer is connected

1. Right-click the Start button.
2. Select Device Manager.
3. Expand Print queues, Printers, Other devices and Universal Serial Bus controllers.
4. Leave the window open, disconnect the cable, wait five seconds and reconnect it.
5. Check whether any device disappears and then reappears in the list.

Restart the print service

1. Press Win + R.
2. Enter services.msc and press Enter.
3. Find Print Spooler.
4. Right-click the service and select Restart.
5. Close the Services window and run the OKI installer again.

Do not disable Print Spooler permanently. Without this service, Windows cannot create a standard print queue or send a test page.

Step 8. If Windows blocks the installer from running

Do not disable system protection immediately after the first warning. First make sure the file was downloaded from the OKI website and that its name matches the model.

1. Right-click the EXE file and select Properties.
2. If the Unblock check box is available on the General tab, select it and click Apply.
3. Open the Digital Signatures tab and make sure the signature belongs to OKI or a regional OKI company.
4. If there is no signature or verification reports that the file is corrupted, delete the file and download it again using the link in this article.
5. If the computer belongs to an organization, do not bypass the restriction: provide the file name to the administrator.

Smart App Control may prevent some traditional drivers and utilities from being installed. Its status can be checked through Settings > Privacy & security > Windows Security > App & browser control > Smart App Control settings.

Step 9. Install the printer over the network if USB remains unstable

B432, MB472 and related models can be connected to the router with an Ethernet cable and a Standard TCP/IP Port queue can be created. In this case, Windows sends data to the device’s IP address, while repeated USB detection and Windows Ready Print are not involved.

1. Connect the OKI device to the router with an Ethernet cable.
2. On the B432, open PRINT INFO > NETWORK and print the network information page.
3. On the MB472 or MB492, press SETTING, then select Reports > System > Network Information.
4. Find the IPv4 Address value on the page.
5. Open Settings > Bluetooth & devices > Printers & scanners.
6. Click Add device, then Add manually.
7. Select the option to add a printer using an IP address or hostname.
8. Enter the IPv4 address and select the PCL6 driver for the exact OKI model.
9. If port settings are requested, select RAW and port number 9100.
10. Print a test page and only then remove the non-working USB queue.

Actions that can make the situation worse

If Windows 11 has already created OKI LTD xxx, first install the exact OKI package and assign PCL6 on the Advanced tab. If no icon appears at all, use the USB mode of the official installer and follow the connection sequence for your model group. Check the cable and Device Manager only after ruling out an incorrect Windows architecture, Windows protected print mode and an unsuitable driver.