How to load Firmware for the first time on WP76XX

I am currently working on a project that uses the WP76xx module at its core. This is my first time using a module that runs embedded Linux. In most of my prior embedded projects, once the PCB is fabricated, i have used an ICE debugger or a JTAG debugger to load my initial bootloader code. In case of WP76xx module, how does that work? Can i use JTAG to load the firmware for the first time? If not, what other approaches should i be considering?

When you buy the module, it already had FW on it.
You can download the new FW to it by .exe file via usb cable.,-d-,1/#sthash.Ge6XMzaD.dpbs