I bought another 411 PCM, it didn't have the service type stickers on it. I was able to read the PCM, got the OS number 12216125 and Hardware number 9386530. I saved the file, and now I'm unable to read or do anything, LOCKED. Now my question: I'm going to attempt another save, can I use the OS number 12212156 when I try to reflash or should I just use the original OS?