Have you gone through code examples present in PSoC Creator? If no, please go through the code examples "PSoC6DFUbasicApp0Uart" and "PSoC6DFUBasicApp1" in PSoC Creator code examples section. You will also get a document with these code examples which has step by step procedure to bootload your application through UART/SPI/I2C.
Thank you for the reply. No I did not try. I think that's what I need I will try to implement this example and see what I got.