phhusson (GSI maintainer) and I are working on a new generic multi-boot solution for modern Android devices, called Paralloid. Unlike previous similar projects, our way of implementing it shouldn't require porting to individual devices -- it should theoretically just work™️ on most Android devices released after Android 10. It's currently still a mess, and for now the scope is limited to booting system images that can share the kernel and vendor images, but I have a few vague ideas about how to remove the limitation in the (far) future. https://github.com/Paralloid/Paralloid
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