OmniROM is available for the OnePlus 5T, making it one of the first Android 8.1 ROMs for the device. In this video Miles loads it on his OnePlus 5T to see how everything runs. Get the ROM for yourself from the OnePlus 5T XDA forums.
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XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.