Unfortunately as I know there is not an easy way.
However, from the post here:
http://community.wd.com/t5/My-Cloud/APP-Transmission-v2-84-for-firmware-V4-12-2014/td-p/770207
It looks like promising since I don’t think the firmware between My Cloud and My Cloud EX2 would be too big.
I haven’t tried yet, but plan to when I have time. I’ll update if I got it working.
Thanks