How to program EWB STERLING module?

Hi
we designed a custom board that contains the wifi module: EWB-STERLING,(453-00014R )
In my board, I routing the USART1 pins to FTDI chip (FT4232 with 4 Channels).
I search all over the laird guides and no one mentioned how to program the board if I have COSTUM BOARD !!!

all the guides talk about the DVK and thats all.
my pc has recognized the FTDI with a generic name when I'm looking in the device manager(without the WICED NAME SIGNATURE).
I dont have any JTAG header( if its must I need to do redesign and I hope its not the case)

so how do I program the EWB module in the first time with USART1 through the FTDI?

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