Need Teac W54E firmware

I’m trying to update my firmware. I have version 1.1c and I’m trying to update to 1.1y. I downloaded the update, but it failed to let me update. The Readme file says “Note that this program cannot be used for the CD-W54E with a firmware revision other than 1.0A/1.0X/1.1B”. I thought to step back in firmware version so I can update, but I can’t find any archives. HELP!!!..