What to Know
This article explains how to delete the UpperFilters and LowerFilters values in theWindows Registry.
Take care to only make the changes outlined below.
We highly recommend that you play it safe bybacking up the registry keysyou plan on modifying.
Class Key Expanded in Registry Editor.
Continue to expand the “folders” until you reach thisregistry key.
Tap or hit the>or+icon next to theClasskey to expand it.
For example, let’s say your DVD drive is showing aCode 39 error in unit Manager.
Many of these GUIDs look the same but they’re definitely not.
They are all unique.
snag the registry subkey corresponding to the machine’s Class GUID that you determined in the last step.
In the results that appear on the window on the right, locate theUpperFiltersandLowerFiltersvalues.
If you don’t see either value listed, this solution isn’t for you.
If you only see one or the other value, that’s fine.
Class Key Expanded in Registry Editor.
Just complete Step 8 or Step 9 below.
Right-click or tap-and-hold onUpperFiltersand chooseDelete.
ChooseYesto the"Deleting certain registry values could cause system instability.
Are you sure you want to permanently delete this value?“question.
You might also see anUpperFilters.bakorLowerFilters.bakvalue but you don’t need to delete either of these.
Repeat Step 8 with theLowerFiltersvalue.
Check to see if deleting these registry values solved your problem.
It may be necessary toreinstall any programsdesigned to utilize the unit you’ve removed theUpperFiltersandLowerFiltersvalues for.
Most rig Manager error codes have several possible solutions.
If you still have problems, try performing aclean install of Windowsor aWindows System Restore.
The UpperFilter for keyboards is typicallykbdclass.
The GUID is
4D36-E96B-E325-11CE-BFC1-0800-2BE1-0318.
If you have a backup,restore the Windows Registry.
Otherwise, reinstall any software related to the hardware rig, or perform a System Restore.
