Have you tried ANAIIS ?
http://aminet.net/package/driver/other/anaiisIt's better to use lha to extract .lha files...
How to install:
-extract files.
-read the readme file (yes begin by that)
- in the bin folder, launch usbstart, it will detect automatically the Subway.
If it doesn't work, your Subway or the clockport has a problem...