Fixing Boot Failures after Sonoma Updates
On the Mac Pro 5,1, a minor macOS update (like 14.8.7) can sometimes overwrite or corrupt the OpenCore EFI partition, preventing the system from booting.
The Recovery Strategy:
- Emergency Boot: Always keep a Bootable OCLP USB or a secondary drive with a native OS (like Mojave) installed. Use this to boot when the main EFI fails.
- Re-install EFI: Once booted into a working environment, open the OCLP app, select your main drive, and run Build and Install OpenCore again. This refreshes the bootloader.
- Post-Install Patches: After restoring the bootloader, reboot into Sonoma and re-apply the Post-Install Root Patches to restore full performance.
Expert Tip: This scenario highlights why having a secondary internal drive with a native OS is the 'gold standard' for OCLP power users.
Original Question: "Heads-up about EFI partition during updates."
Yesterday, when updating (not upgrading) to Sonoma 14.8.7, during the updating process, the OCLP EFI partition got affected, and would not boot anymore on the 2nd to last restart that leads to using the Mac briefly without root patches applied (that's when they get applied). In previous updates within Sonoma the entire updating process completed without issue.
Conveniently, I have a native Mojave install (last OS native to my Mac) on a different internal drive, so booted into that, and reinstalled the OCLP boot partition on the relevant drive for the Sonoma OS, and it booted again correctly, and finished the update, and worked normally thereafter (this is an amazing program).
First time this has happened, so wanted to pass that on.
So, the need to re-install the EFI partition is possible during updates, so best have a bootable OCLP USB flash drive or other alternate bootable external option handy if you don't have a 2nd internal OS installed.
MacPro 5,1, 2010-12
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