Sony STR-DA3300ES Technical Bulletin page 4

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3-3-6. Double-click the new icon on the desktop.
3-3-7. The Flash Writer window will be displayed.
3-4. Flash Writer set-up
3-4-1. When the Flash Writer is displayed, click to set the ISP settings as follows.
Connection Serial
Chip FLI8668
Flash device SST39VF320
3-4-2. Click [Settings] to set the serial port that actually connected with the jig. In the example picture this is
"COM4".