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I summarized my initial post about trying various things without going through all of the specific details but I don’t have ATMOS speakers connected to the TV so I could only test 4K. I did get 4K directly connected so I figuring it was either receiver issue or AppleTV. Apple tech confirmed when...

I'm pretty sure it is the firmware update that caused the issue based on the testing done. It is also possible that the firmware is only affecting some brands/models of receivers which would explain why there are not complaints rolling in. My final test was borrowing a friends Gen 2 4K. It was...

I didn't see an option for that in the menu. The only reset I found resets it where you set it up like its just out of the box but not the firmware. When troubleshooting with Apple, they said that it is not possible to go backwards on firmware.

Thanks John. And just to confirm, your OS is 17.1?

I have an Apple TV 4K 2nd Generation (OS 17.1) connected to an AudioControl Concert AVR9 ATMOS receiver. This is connected to an 8K Samsung TV. ATMOS and 4K has been working fine until a few weeks ago around the 17.1 update. Since then, Apple TV settings only offers me 1080p HDR as the highest...