Hi! I’ve been trying to install a different operating system on my iMac Pro 2017 for a few days, but in the boot menu, it doesn’t show any boot devices except the one macOS is installed on, i turned off all security measures in Startup Security Utility but it only recognizes my USB Thumbdrive in Disk utility. If anyone could help that would be great
dashtiv
User level: Level 1 (20 points)
User level: Level 1 (20 points)No boot devices found the macOS boot menu
Posted on Oct 3, 2026 10:50 AM