Well, it’s an odd situation: WD claim to be rolling out the new firmware upgrade, using automatic upgrade, but at no point have they revised their Product Update page to add release notes for the new firmware, or to make the new firmware available for manual download; it still shows 4.01.04.422 (5/11/2015) as the latest firmware:
http://www.wdc.com/wdproducts/updates/?family=wdfmycloudupdate
On the other hand, there is a .deb file available if you know where to look:
http://download.wdc.com/nas/sq-040400-303-20150902.deb
It’s odd that this is a .deb file, because all previous upgrades have been released as zipped .deb files; see the instructions for manual upgrade at the Product Update page linked above.
So something’s not joined up at WD…
