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No, you don't need a 'very bespoke AOSP' to turn your phone into a Rabbit R1 — here's proof
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
I’m not entirely sure because I’m not very knowledgeable about CPUs, but it seems this is largely a problem with ARM architectures and their lack of standardization, isn’t it?
There's nothing like uefi between the os and the hardware