Since there is no custom firmwares, it's not a problem as the manufacturer releases updates regularly and you can even contact them with bugs or future improvements needed.
You can use the Magisk ATV addon I posted several times in the forum to install it over any stock firmware(single boot or dual-boot) then you can have AndroidTV UI without flashing anything, it works the same as the Sasvlad ATV firmware(paid for newer versions) but is completely free.
The video is in Russian but you can look at the screen to see how to install it.
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