I'm running Mojave on a MacPro5,1 (previously 4,1), which requires using an upgraded GPU, and I'm using the Radeon RX580 (which is listed by Apple as supported). I need to disable SIP to enable continuity on the upgraded Bluetooth module I've installed. Holding Command+R when booting to go to recovery mode doesn't show anything on either of the displays I have connected. Is there a way to disable SIP without being able to see a display, or a route that would be able to display via a third-party GPU?
Thanks