Sorry you're having an issue there kmcong. If your unit wont play a 192K file then something is amiss. And I think something must have gotten crossed in translation. Nobody want you stuck with a DDC that has an issue.
If I follow correctly, Denafrips wants you to downgrade the fw to v1.8 as there was a possible issue with the newer v1.9.
Pick it back up with TEK in email and we can see about sending it here for service if need be.
Thanks, TK