What vintage is your 975? You can check the SW version of the 975 by pressing Input and Mute buttons together. (DO NOT press Tuner and Mute together as this will perform a factory reset).
SW version 5.3 is the latest that I'm aware of.
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-103, XBOX360, Xbox One
Samsung 51" Plasma
RR2150 w/Klipsch SCR-2