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You can use CyU3PConnectState() API to force FX3 to enumerate as a HS device. Now, you need to connect a FS host to force FX3 into FS mode. wMaxPacketSize can be set to 8 bytes in the CyFxUSBFSConfigDscr for FS device.
You can take USBBulkSourceSink example project as a reference.