It looks like you have already programmed FX3 and a firmware is running in the FX3 RAM. In order to reprogram the FX3, the bootloader should be running. Please hard reset the FX3 using 'RESET' push button or power cycle the EVM to get the bootloader running for programming FX3.
I did not short all jumpers. After I did that,
I could download firmware to CYUSB3KIT-003.
Thank you for your help!