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How to disable SIP to install Catalina on MacPro 5,1
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I'm trying to install Catalina on a MacPro 5,1. The "final" step is to disable SIP.
My MacPro: 5,1 early 2012, 2x2.4 Xeon/64DDR3/Radeon RX560
I cannot access recovery mode to disable SIP. Tried CMD R/CMD OPT R/Make a bootable USB install and boot from it (doesn't work, can't access the boot menu by holding OPT when booting the computer). Also tried reseting SMC & PRAM.
Is it possible that the boot selection menu is not displayed because of my graphic card?
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