The firmware update allows Dolby Digital 5.1 surround with Apple TV 4K and Dolby Vision but not Dolby Atmos yet. I receive both Dolby Atmos and Dolby Vision with ROKU with no problems. Glad they are working on it with people who don’t have HDMI eARC but have HDMI ARC instead. I hope TVOS 15 may fix the problem.
sony xbr-75z9d received a firmware recently. improves compatibility with sonos Arc.
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