Downgrading to the Older Version of the CyUSB.sys Driver – KBA87931

Question: How do you downgrade to the older version of the CyUSB.sys driver?

 

Answer:

When you try to update the driver manually by pointing to the inf file, CyUSB.sys (contained in the folder where you are pointing to the CyUSB.inf) will be copied to “C:\WINDOWS\system32\drivers”.

Because “C:\WINDOWS\system32\drivers” contains a newer version of the CyUSB.sys file, you will get the warning message “The target file exists and is newer than the source.”

If you click Yes to “Overwrite the newer file?” in the Confirm File Replace window, then the older version will be copied to “C:\WINDOWS\system32\drivers”.

For more information see the attached document on how to downgrade to the older version of the CyUSB.sys driver.