4k on Bolt Vox 1tb 4k?

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I’ve been using the Bolt Vox 4k 1tb on an HD tv for a couple of years and it’s been ok. I just ordered a Sony A8H 65” 4k OLED tv, thinking it would work on the Bolt - are people finding it a good 4k source? I use it for watching and recording OTA, for Amazon Prime and Netflix. Are there issues with 4k HDR? The TV comes Monday, and I’m concerned that, from reading the forum a bit, that 4k on the Bolt may have issues. How is it for sound? Do the various formats like Dolby Atmos get passed to the receiver (Denon avr-6700h)?
It looks like TiVo has dumped the Bolt line - what are people using for recording OTA then?
Thanks!