How to Easily Delete the UpperFilters and LowerFilters Registry Values

 What to Know

• 1. Open the Registry Editor and go to HKEY_LOCAL_MACHINE > System > CurrentControlSet > Control > Class.
• 2. Determine the Class GUID for the hardware device that you're seeing the error code for, then select the corresponding registry subkey.
• 3. Locate the UpperFilters and LowerFilters values, right-click them, and then select Delete and Yes to confirm.

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Removing the UpperFilters and LowerFilters values in the Windows Registry is easy and should take less than 10 minutes:

1. 1. Execute regedit from the Run dialog box (WIN+R) or Command Prompt to open Registry Editor.

   

   Changes to the registry are made in these steps! Take care to only make the changes outlined below. We highly recommend that you play it safe by backing up the registry keys you plan on modifying.

   If you're using Windows 10, 8, 7, or Vista, you may need to answer Yes to any User Account Control questions before Registry Editor will open.

2. 2. Locate the HKEY_LOCAL_MACHINE hive on the left side of Registry Editor and then tap or click the > or + icon next to the folder name to expand it.

   

3. 3. Continue to expand the "folders" until you reach this registry key.

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class 
   

   

4. 4. Tap or click on the > or + icon next to the Class key to expand it. You should see a long list of subkeys open up under Class that looks something like this:

   {4D36E965-E325-11CE-BFC1-08002BE10318}
   

   

   
   

   Each 32-digit subkey is unique and corresponds to a particular type, or class, of hardware in Device Manager.

5. 5. Determine the correct Class GUID for the hardware device. Using this list, find the correct Class GUID corresponding to the type of hardware that you're seeing the Device Manager error code for.

   

   For example, let's say your DVD drive is showing a Code 39 error in Device Manager. According to the list above, this is the GUID for CD/DVD devices:

   4D36E965-E325-11CE-BFC1-08002BE10318
   

   Once you know this GUID, you can continue with Step 6.

   Many of these GUIDs look the same but they're definitely not. They are all unique. It might help to know that in many cases, the difference from GUID to GUID is in the first set of numbers and letters, not the last.

6. 6. Select the registry subkey corresponding to the device's Class GUID that you determined in the last step.

7. 7. In the results that appear on the window on the right, locate the UpperFilters and LowerFilters values.

   

   If you don't see either registry values listed, this solution isn't for you. Double-check that you're looking at the correct device class but if you're sure you are, you'll have to try a different solution from our How to Fix Device Manager Error Codes guide.

   If you only see one or the other value, that's fine. Just complete Step 8 or Step 9 below.

8. 8. Right-click or tap-and-hold on UpperFilters and choose Delete. Choose Yes to the "Deleting certain registry values could cause system instability. Are you sure you want to permanently delete this value?" question.

   

   You might also see an UpperFilters.bak or LowerFilters.bak value but you don't need to delete either of these. Deleting them probably won't hurt anything but neither one is causing the Device Manager error code you're seeing.

9. 9. Repeat Step 8 with the LowerFilters value.

   

10. 10. Verify that neither an UpperFilters nor a LowerFilters registry value exists, and then close Registry Editor.

11. 11. Restart your computer.

    

12. 12. Check to see if deleting the UpperFilters and LowerFilters registry values solved your problem.

    If you've completed these steps due to a Device Manager error code, you can view the device's status to see if the error code is gone. If you're here because of a missing DVD or CD drive, check This PC, Computer, or My Computer, and see if your drive has reappeared.

    

    It may be necessary to reinstall any programs designed to utilize the device you've removed the UpperFilters and LowerFilters values for. For example, if you removed these values for the BD/DVD/CD device, you may have to reinstall your disc burning software.