Case sensitive samba export

WD Legacy Products My Book Live Duo
4

I’ve checked now, the reported version is:

MyBookLiveDuo 02.43.03-022 : Core F/W

last update:

So 20 Okt 2013 12:28:36 CEST

clicking the search button for updates report no new update available

Please advise me how to enable case-sensitive mounts on my MyBookLiveDuo (just as on my MyBookLive where it works).