We do not know what is your definition of easy...
Your options I know of:
a) easiest - go to dealer and let him install latest FW 74.00.324 and anfterwards the new usb hub+2new cables.
b) do a) on your own
c) do the serial access www.mazdatweaks.com/serial and afterwards install AIO AA tweak (less stable than official version and AIO is not being updated anymore, as it was a user project).
I only comfortable with a)
Is there any place you find what is the latest firmware to use?