No custom ROMs or kernels, how do you think we would build that stuff without source code? Unless one of you know where to get source code but I dont. Legally, Onyx needs to supply us with source code because of GPL licensing of Linux, but they wont do it.
for Linux just run termux, unless your feeling dangerous then run Linux Deploy
For split screen, no, that is the one thing I really recommend not trying unless you are willing to risk data loss.
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