Resolving Sonoma Installation Issues on Mac Pro 6,1
The 'red screen' freeze in Chrome and Slack on the 2013 Mac Pro is a known issue with the AMD FirePro drivers in macOS Sonoma.
The Fixes:
- Disable Hardware Acceleration: This is mandatory for Chromium-based apps on the D300/D500/D700 GPUs in Sonoma. In Chrome settings, turn off 'Use graphics acceleration'.
- Preflight Error 21: This error during a Monterey downgrade means the installer detects a 'newer' firmware version than it expects. Fix: You must boot from a Monterey USB installer and wipe the internal drive completely (including the EFI partition) to bypass this check.
- OCLP Settings: Ensure you are using the latest OCLP version and have applied the Post-Install Root Patches specifically for the AMD GCN architecture.
Original Question: "Trying to take a late 2013 Mac Pro from Monterey --> Sonoma"
 | SOS Trying to upgrade my late 2013 Mac Pro (with Monterey) to Sonoma via OCLP. I’m not the tech savviest but I’m fairly resourceful and can follow instructions, or so I thought. I was using this guide: https://blog.greggant.com/posts/2023/01/23/opencore-legacy-patcher-quick-instructions.html I got to the post install step and did everything I was prompted to yet Chrome and Slack apps are not working - getting the red screen that makes the whole computer freeze up. Most other apps appear to be working. It’s frustrating because I read all the directions and was certain my computer was compatible. I checked all of my hardware specs against the known issues/incompatibilities listed for OCLP and the different OSs. I selected Sonoma instead of Ventura because I didn’t want to have to do this process again so soon when support for Ventura inevitably expires and instead of Sequoia figuring since Sonoma had been around longer, that more issues would have been resolved.. I’ve restarted my computer and run the post install root patch several times each. I’ve tried to revert root patches. Still no luck. Someone on a misc thread recommended rebooting in recovery mode and using first aid repair. Tried that, didn’t change anything. I tried to install Monterey (to start over fresh or try Ventura instead) but got the preflight error 21 message. Any advice or suggestions? [link] [comments] |
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