Another option is Maru:
https://maruos.com https://github.com/maruos/maruos
Maru is an open-source project and has been well-tested for nearly three years now. We've also been featured on HN quite a few times actually.
Speaking of Samsung, Maru already has early builds available for the Samsung S9: https://groups.google.com/d/msg/maru-os-dev/YVkUiwuKMRQ/fOQY...
I'm the creator btw.