I've tried that one, specifically the "8.29 INT (Buffalo-Internal)" one, and it takes me to a page that says;
"Offsite linking is not allowed. Shame on you to try and steel our bandwidth.
Download from the original page:
The firmware page
The firmware forum"
I then go into "The Firmware Page", then go to the Pioneer 111D and try a link there for the 8.29 Int. and it takes me to a page for Buffalo in Japanese?