Hi David,
Please note that the E473 can only see/load Styles with the file extension .STY. In addition, as mentioned, the Style files must be in SFF1 format and smaller than 50 KB. For example, if you convert SFF2 FreePlay styles to SFF1 on the computer, you need to change the extension from .FPS to .STY and also make sure they don't exceed the mentioned size.
Best regards,
Chris