Output level of RS451

Hi There,
I been away home for 10 days and turned on my RS451 got informed update software which I did it.
However, the output level (using adjustable since my Cello has no volume control) dropped down a lot, forced to turn max level but still not felling enough. Usually only 40-52 %
Anyone has same issue ?
Thanks

have same issue with volume and few more. VU meter show on max level, and u cant switch between sources, example try BT and switch Optical - no sound at all. with older firmware no issues, after upgrade im very dissapointed, expensive devices and so many problems. Later will try upgrade to 5.11.08 (released today).

Totally agreed,best give me back my older software…just headache !
5.11.08 still not fix my problem.