unsuported MacBook not booting up

in Genius Bar

I updated my MacBook (late 2009) to macOS mojave with dosdude1.com patcher. Everything went smooth - as for 9 year old computer - until I updated to macOS mojave’s second update through standard update chanel. 

Now when the computer is trying to boot it’s not compliting the process and reboo itself. That proces continues over and over. I tried to secure boot it, recover from a macOS copy... nothing is working. What can I do? Preferably downgrade it to High Sierra.


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