I explain my process, used a few times now, to put a different hard drive into the My Cloud enclosure and to deal with one specific issue (no Dashboard post v3.x to v4x. firmware upgrade) in the following post.
http://community.wd.com/t/unbrick-then-firmware-upgrade-equals-no-dashboard/136666/6
If one has a v2.x My Cloud that process won’t work since its specific for the v3.x/v4.x My Clouds. v2.x My Cloud’s have a different firmware and quite possibly different partition layout.
