iATKOS | United Kingdom

Hey guys, I’ve been using open core legacy patcher 2.4.1 on my macbook pro mid 2012 with retina to run Ventura for the past year. I now want to switch to Sonoma. Is there a good walkthrough that I can reference for this task? I specifically want one that takes into consideration that I already have open core installed on my laptop. Most walkthroughs seem to be geared for fresh open core installs. So far I’ve tried using chatgpt but its royally confused me. So far, It’s had me create the USB installer but booting from the USB hasn’t worked. When i click on either of the “EFI boot” options, am taken to the Ventura login screen and I don’t get the macOS Utilities screen. So far its troubleshooting has consisted of recreating the USB installer and trying it again and again. Any help is appreciated. Thank you.

Step 2: Boot from the USB 1. Turn on your Mac and immediately hold the Option (⌥) key. 2. You’ll see the boot menu. Look for something like “EFI Boot” – that’s your OpenCore USB. 3. Select it and press Enter.

If your Mac is supported but old, OpenCore ensures the Mac can boot the installer properly.

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Step 3: Open the macOS Installer • After booting, you’ll see the macOS Utilities screen: 1. Restore from Time Machine (skip if not needed) 2. Install macOS → choose this 3. Disk Utility → optional, if you want a clean install