Ratoc Systems U2SCXU - Manual (Page 61)

Macintosh
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6)The window shown at step 4) will appear. Click [Write].
The message saying updating completed will appear. Click [OK]. Select
[Quit] from the [File] menu. Remove the U2SCXU from the Mac and turn
off the SCSI device attached to the U2SCXU.
7)Change the settings from [U2SCX Configuration] to the previous setting
with [Extensions Manager] and restart your Mac. Turn on the SCSI device
and connect the U2SCXU to the Mac. Your settings now starts working.