OKI Printer Not Working After a Windows Update? Fix It

Find out what the update changed on your PC, then work through the fix that matches it, from a quick spooler reset to rolling the update back.

It's one of the most frustrating printer problems because nothing about the printer changed. Your OKI was printing on Friday. Windows installed an update over the weekend, and on Monday the job sits in the queue, the printer shows offline, or the print window is suddenly missing your trays, duplex, and color settings. Sometimes printing still works but the scanner on your OKI MFP has disappeared.

The printer is almost never the problem. Windows updates change drivers, security settings, and the way your PC talks to devices on USB and your network, and OKI printers get caught in the middle. The good news is that most of these problems can be fixed without calling anyone.

This guide covers Windows 11 and Windows 10, and it's written for OKI laser printers and MFPs connected by USB, Ethernet, or Wi-Fi.

What Changed After the Update?

Start with what you're actually seeing. Each symptom points to a different cause, and jumping straight to the right fix saves a lot of reinstalling.

Why Windows Updates Break OKI Printing

Most of the time, it's one of these five things.

Windows picked its own driver. Microsoft is steadily moving Windows 11 away from printer manufacturers' drivers and toward its built-in Microsoft IPP Class Driver. Since July 1, 2026, Windows ranks that driver first whenever a printer supports it. If your OKI gets reinstalled after an update, Windows may set it up with the Microsoft driver instead of OKI's. Basic printing still works, but OKI's tray, finishing, and color controls don't.

A new security setting removed the OKI driver. Windows 11 version 24H2 added Windows protected print mode. When it's switched on, Windows uninstalls every printer that uses a manufacturer's driver. OKI has told its customers directly not to turn it on if they use OKI printer or fax drivers.

The print service got stuck. Updates restart Windows, and a job that was waiting in the queue can freeze the Print Spooler, the Windows service that hands jobs to your printer. Everything behind it waits.

The connection changed. An update can reset your network to Public, which blocks the PC from reaching devices on your network. On USB, recent Windows 11 updates changed how the PC talks to printers that support IPP over USB, which is behind the missing scanner and garbage printout problems on some OKI MFPs.

Security got tighter. Windows 11 24H2 requires signed file sharing connections by default, which breaks scan to folder on OKI MFPs that don't support it. Security fixes for printer sharing have also caused error codes on shared printers for years.

It's worth knowing that OKI stopped selling printers in the US, Canada, and Latin America in 2021. Drivers for existing models are still on OKI's US site, but new Windows releases don't always get a fresh OKI driver right away, so some of the fixes below rely on Windows settings rather than a driver update.

Before You Start: Three Quick Checks

These take a couple of minutes and tell you exactly what you're dealing with. Jot down what you find. If you end up contacting IT or OKI, it's the first thing they'll ask for.

1. Find out which update installed.
Go to Settings > Windows Update > Update history. Under Quality updates, you'll see the recent updates with their KB numbers and install dates. Note the one that lines up with when your OKI stopped working.

2. Check your Windows version.
Go to Settings > System > About and look under Windows specifications for Version (for example, 24H2 or 25H2) and OS build. If the version number changed recently, you had a feature upgrade, not just a monthly update. That matters in Fix 9.

3. See which driver your OKI is using.
Go to Settings > Bluetooth & devices > Printers & scanners, click your OKI printer, and open Printer properties. On the Advanced tab, the Driver field shows what's in use. If it says something like "OKI C332 PCL6," that's OKI's driver. If it says Microsoft IPP Class Driver, Windows swapped it, and Fix 2 is where you want to go.

Also print a test page from the OKI's own control panel (look for a configuration or information page in the menu). If that page comes out fine, the printer hardware is working and the problem is on the Windows side.

How to Fix an OKI Printer After a Windows Update

Work from the top unless the symptom table sent you straight to a specific fix. The early fixes are quick and safe. The later ones change more.

Fix 1: Restart in the Right Order and Reset the Print Spooler

A plain restart clears more post-update printing problems than you'd expect, but the order matters.

1. Cancel what's in the queue. Open Settings > Bluetooth & devices > Printers & scanners, click your OKI, choose Open print queue, and cancel every job.
2. Turn off the OKI with its power switch and leave it off for about a minute.
3. Restart the computer and let it fully load.
4. Turn the OKI back on and wait until the display shows it's ready before you try printing.

If jobs still pile up, reset the Print Spooler:

1. Press Windows + R, type services.msc, and press Enter.
2. Right-click Print Spooler and choose Stop.
3. Open File Explorer, go to C:\Windows\System32\spool\PRINTERS, and delete the files inside. Leave the folder itself alone. These are only waiting print jobs, nothing else.
4. Back in Services, right-click Print Spooler and choose Start. Double-click it and make sure Startup type is set to Automatic.

Still stuck? Try Windows' built-in check: Settings > System > Troubleshoot > Other troubleshooters, then click Run next to Printer. On current Windows 11 builds, this opens the Get Help app, which runs the checks for you. For jobs that won't clear no matter what, our guide to an OKI print job stuck in the queue goes deeper.

Fix 2: Put Your OKI Back on the OKI Driver

If your printer lost its settings after the update, or now shows up as "OKI LTD" followed by the model name, Windows is running it on the Microsoft IPP Class Driver. You don't have to delete the printer to fix this.

1. Make sure OKI's driver is on the PC. If you removed it, or you're not sure, download the driver for your model from OKI's official site (oki.com/us, under Support > Drivers & Utilities) and install it. Our OKI printer driver guide explains which driver to choose.
2. Go to Settings > Bluetooth & devices > Printers & scanners, click the OKI printer, and open Printer properties.
3. On the Advanced tab, pick your OKI driver from the Driver list and click Apply.
4. Let the driver read your printer's setup. For a PCL6 driver, open Device Options and click Get Printer Information, then Apply. For a PS driver, open Device Settings, click Get Printer Information, then Setup and Apply.
5. Print a test page and check that your trays and color options are back.

To stop Windows doing this again the next time a printer gets added, turn off Default install printers using Windows Ready Print on the Printers & scanners page. It only affects printers added after you change it, so it won't touch anything already working.

Fix 3: Turn Off Windows Protected Print Mode

If your OKI disappeared from the printer list entirely after an update or a settings change, check this one next. When Windows protected print mode is on, Windows removes printers that use a manufacturer's driver and deletes that driver from the PC. OKI's own Windows 11 compatibility notes say its printer and fax drivers stop working in this mode.

1. Go to Settings > Bluetooth & devices > Printers & scanners.
2. Scroll to Printer preferences and find Windows protected print mode.
3. If it's on, click Turn off, then Yes.
4. Reinstall the OKI driver from oki.com, then add the printer again.

Turning it on also removes the Microsoft XPS Document Writer and Windows Fax and Scan. To get them back, search Windows Features in the Start menu to re-enable XPS, and add Windows Fax and Scan under Settings > System > Optional features.

On a work computer, this setting may be locked by your IT department through group policy. If the Turn off button isn't available, that's why, and it's their call.

Fix 4: Do a Clean Reinstall of the OKI Driver

Removing the printer from Windows doesn't remove its driver. If the old driver files are damaged, Windows quietly reuses them, and your reinstall ends up with the same problem. Removing the driver package too is what makes a reinstall actually start fresh.

1. Restart the PC so nothing is waiting in the queue.
2. In Settings > Bluetooth & devices > Printers & scanners, click the OKI printer and choose Remove.
3. On the same page, scroll down and open Print server properties.
4. Go to the Drivers tab. If you see Change Driver Settings, click it first.
5. Select every OKI driver listed, click Remove, choose Remove driver and driver package, and confirm. If Windows says the driver is in use, restart and try steps 3 to 5 again.
6. Restart once more, then run the latest OKI installer for your model and Windows version.

Download the driver only from oki.com. OKI drivers are free, and sites that ask you to pay or install a "driver updater" first aren't worth the risk. The OKI printer driver guide walks through the installer screen by screen.

Fix 5: Get a Network OKI Back Online

If your OKI shows Offline after the update and it's connected by Ethernet or Wi-Fi, check these three things in order.

Is your network set to Private? An update can flip your network to Public, which stops the PC from finding printers.

1. Go to Settings > Network & internet and click Wi-Fi (or Ethernet).
2. Open the properties for the network you're connected to.
3. Under Network profile type, choose Private network.

Do this only on your home or office network. On public Wi-Fi at a coffee shop or airport, Public is the right setting.

Does the port still point to the printer? Open Printer properties > Ports and see which port is checked. Compare the IP address there with the one on a configuration page printed from the OKI's control panel. If they don't match, the printer picked up a new address and Windows is looking in the wrong place.

Is it using a WSD port? Printers added automatically often use a WSD port, and those tend to drop after updates. Switching to a Standard TCP/IP Port with the printer's IP address is usually more reliable.

Our OKI printer offline guide covers port changes, IP addresses, and OKI's LPR Utility step by step.

Fix 6: Fix a USB OKI MFP Whose Scanner Disappeared or Prints Gibberish

These two problems come from the same place: how Windows 11 handles USB printers that support IPP over USB, a way of sending network-style print commands through the USB cable.

If the scanner or fax is missing (printing still works)

Microsoft has confirmed that starting with the March 10, 2026 update (KB5079473) and later, Windows 11 can fail to recognize the scanner and fax parts of some USB-connected multifunction printers, and scanner drivers may refuse to install. As of Microsoft's latest update on the issue in July 2026, it had no permanent fix yet. Here's what's worth trying:

1. Remove and reconnect. In Settings > Bluetooth & devices > Printers & scanners, remove the OKI MFP, unplug the USB cable, then plug it back in. Microsoft says this brings the scanner back in some cases.
2. Check the Windows Image Acquisition (WIA) service. Press Windows + R, type services.msc, and find Windows Image Acquisition (WIA). Set Startup type to Automatic, click Start, restart the PC, and add the printer again. This fixed a missing scanner on an OKI MC352dn in one Microsoft Q&A case, and it's harmless to check.
3. Switch to a network connection. If your OKI has Ethernet or Wi-Fi, connecting that way sidesteps the USB issue completely. OKI lists this as one of its own workarounds.
4. Turn off IPP on the printer. OKI also lists this workaround, done through the printer's web settings. The trade-off: you lose IPP printing and AirPrint, so iPhones, iPads, and Macs using AirPrint won't see the printer anymore.

For Windows 11 24H2 PCs that hit an earlier version of this problem in 2025, OKI pointed to updates KB5050094 and KB5051987 as fixes. If your PC is fully up to date, those are already installed.

If pages print "POST /ipp/print HTTP/1.1" and other strange text

This was a known Windows 11 bug after the January 2025 preview update (KB5050092), mainly on versions 22H2 and 23H2. Microsoft fixed it in later updates, so installing the latest Windows updates is the first step. If it keeps happening, the same two OKI workarounds apply: move the printer to a network connection, or turn off IPP on the printer.

Fix 7: Get Scan to Folder Working Again After Windows 11 24H2

If your OKI MFP used to scan straight into a shared folder on your PC and stopped after the upgrade to 24H2, the reason is file sharing security, not the scanner.

Windows 11 24H2 now requires SMB signing on file sharing connections by default, on Home, Pro, Education, and Enterprise editions. On Windows 11 Pro, it also blocks guest connections, the kind that don't need a username and password. OKI's support notes say at least some of its MFPs don't support SMB signing, and many older scan to folder setups were built on guest access.

What to do:

1. Stop using guest access. Create a Windows user account (or use an existing one) with a password and permission to the scan folder.
2. Update the scan destination on the OKI. In the printer's web settings, edit the network folder profile so it logs in with that username and password instead of guest. OKI recommends this for Windows 11 Pro 24H2 PCs in a workgroup.
3. Update the OKI firmware if your model has a newer version on oki.com, since newer firmware can add security support older versions don't have.
4. If the MFP still can't connect, switch methods. Scan to email, scan to USB drive, or scan from the PC using OKI's scan software or Windows Fax and Scan.

You'll find guides online that fix this by turning off SMB signing or re-enabling guest logons with PowerShell. Microsoft specifically warns against it, because it opens your PC to interception and relay attacks. If you're in an office, leave that decision to IT.

Fix 8: Fix a Shared OKI Printer That Throws an Error

In a lot of small offices, one PC has the OKI plugged in or installed and shares it with everyone else. After a security update, the other PCs can start failing with errors like 0x0000011b ("Operation failed") when they print or try to connect.

That code goes back to Windows print sharing security changes made in 2021. The host PC now requires a higher level of authentication from other computers, and older or not-yet-updated PCs can't meet it.

Try this, in order:

1. Update every PC involved, both the one sharing the printer and the ones printing to it, then restart them all.
2. Skip the share entirely. If your OKI is a network printer, add it to each PC directly by its IP address instead of through the other computer. Each PC gets its own OKI driver, and the host PC doesn't need to be switched on for anyone to print. This is the fix we'd recommend for most offices.
3. Leave the registry alone. Several popular fixes online tell you to add a registry value that turns the security check off. It reopens a known security hole, so we don't recommend it.

Reports from September 2026 describe a separate problem after that month's updates, where 32-bit apps on print servers and Remote Desktop hosts fail with an "Entry Point Not Found" error tied to Windows' shared driver files. Microsoft hadn't acknowledged it at the time of writing. If that sounds like your setup, it's an IT or server issue, not an OKI one.

Fix 9: Uninstall the Update, Go Back, or Pause

If nothing above works and you're sure the problem started with a specific update, you can take that update back out. Treat this as a temporary fix while you wait for Microsoft or OKI to fix the real cause.

If it was a monthly update (a KB number)

1. Go to Settings > Windows Update > Update history.
2. Scroll down and click Uninstall updates.
3. Find the update you noted in the checks above and click Uninstall.
4. Restart and test the OKI.

Not every update can be removed, and you'll need an administrator account. Microsoft doesn't recommend removing updates, because most monthly updates include security fixes.

If Windows upgraded to a new version (for example, 24H2 to 25H2)

1. Go to Settings > System > Recovery.
2. Click Go back, next to "Previous version of Windows," and follow the prompts.

This option only appears for 10 days after the upgrade. Your files stay, but apps, drivers, and settings added since the upgrade are removed, so you'll likely need to reinstall the OKI driver afterward.

Buy time with Pause updates
Monthly Windows updates are cumulative, so the change you just removed comes right back with next month's update. Go to Settings > Windows Update and choose a pause length (Windows 11 lets you pause for up to five weeks) to give Microsoft time to release a fix. Check the update notes before you let updates resume.

Keep the Next Update From Breaking It

You can't stop Windows from updating forever, and you shouldn't. But a few small habits make updates a lot less painful for your OKI.

• Add network printers by IP address, not through automatic discovery or another PC's share. It's the single biggest thing you can do to avoid "offline" surprises.
• Give the OKI a fixed IP address by reserving one in your router, so the printer's address doesn't change after a power cut or router reboot.
• Turn off "Default install printers using Windows Ready Print" before you add or reinstall an OKI, if you want Windows to use OKI's driver instead of its own.
• Leave Windows protected print mode off as long as you rely on OKI's printer or fax drivers.
• Save your OKI installer somewhere on the PC or a shared drive, so a reinstall takes five minutes instead of a download hunt.
• Hold off a few days before installing optional "preview" updates, and pause updates for a week if you have something big to print. Most printing bugs get reported within days of a release.
• In an office, update one PC first. If the OKI still prints the next day, update the rest.

When It's Time to Get More Help

Some of these problems aren't worth fighting on your own.

• You're on a work PC and settings like protected print mode, SMB, or Windows Update are grayed out. Those are controlled by your IT team, and changing them around policy usually gets undone at the next sync.
• Several PCs broke at once after the same update, especially if you print through a server. That's a network or server fix, not a printer fix.
• The OKI's own configuration page won't print, or the display shows an error code. That points to the printer itself, not Windows. Our list of OKI printer error codes and messages can help you decode it.