worked for me - so my xpentology works with DSM 6.2.3-25426 Update 3
but the problem is that HDD do not hibernate.
in messages I can see new lines like
kernel: [11620.550076] Invalid disk Number [9]
...
kernel: [11620.594255] Invalid disk Number [16]
which I think stops hibernating
I skipped one step: "migrate" to version 6.2.3 - how to do it? when I try to manual install firmware from DSM I get error (I tried few pats files):
Failed to accomplish the update! (errno = 21)