Driver certification

Question

I have a USB driver that was developed and signed about ten years ago. It consists of an Inf file with its associated Cat file, and a Sys file. Now I need to make an update to the drivers Inf file in order to change some PID values. If I try to change the Inf file, generate a new Cat file and sign that without doing any changes to the Sys file, Windows gives me an error 52 when I try to install the newly certified Inf/Cat file.

Will I need to recertify my Sysfile if I want to change the Inf file, or is it possible to just create new Inf and Cat files, certify them and keep the old certification of the Sysfile?