Ok.  Good news.  It works.  It did not at first so I think you probably encountered the same issue.  What I found out is that the PIR-1 firmware will update when connected to CCP, and then will update firmware when connected to Accelerator.  I plugged in the PIR-1 first, then opened CCP and tried to learn.  It did not work.  I unplugged the PIR-1 and plugged back in and still did not work.  I then closed CCP and unplugged the PIR-1.  I started CCP and THEN plugged in the PIR-1.  It didn't do anything at this time.  When I went to learn a code, it updated the firmeware and then was able to learn.  I tested the learned code via the PIR-1 and it worked.

I'd suggest doing what I did and start CCP first, then connect the PIR-1 and then try to learn a code to see if your firmware updates.