Microtek Converter - Manual (Page 45)

Macintosh
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4. Click a small button at left of Select New Firmware Data File to
specify firmware data file.
5. The window in the previous page will appear again. Click Write to update
the firmware. When the message says “Updating was successful”, click OK.
Click [Quit] from the [File] menu.
After updating firmware, revert extensions setting. Open the Extensions
Manager and change selected set from FR1SX CONFIGURATION to the
previous settings you used. Then restart the computer.