How to Fix Just downloaded latest Sequoia MacOS installer but can't seem to install it anywhere; am already running OpenCore 15.7.3 on my iMac During macOS Boot or Installation
Boot failures need a methodical pass through firmware, EFI, storage and USB before reinstalling macOS.
Step-by-Step Fix:
- Back up first: Make a Time Machine backup or clone before changing OpenCore, EFI, root patches, or macOS versions.
- Boot verbose: Add
-v keepsyms=1 debug=0x100so the last real error is visible instead of only an Apple logo. - Check BIOS/UEFI: Disable Secure Boot, Fast Boot, CFG Lock if possible, VT-d unless mapped, and set SATA to AHCI.
- Refresh OpenCore: Update OpenCore, kexts and SSDTs, then run a config sanity check with ProperTree or ocvalidate.
- Use a clean installer: Recreate the USB installer, try another port or USB 2.0 hub on old Macs, and reset NVRAM before retrying.
Final check: Change one thing at a time, reboot, and keep a copy of the last working EFI before the next test.
Original Question: "Just downloaded latest Sequoia MacOS installer but can't seem to install it anywhere; am already running OpenCore 15.7.3 on my iMac."
 | My iMac 2015 is running 15.7.3 Open Core and it runs fine but want to update to the latest supported version which is 15.7.7; I downloaded it within OpenCore after clicking on Create macOS Installer but it won't let me select a disk to install it (as pictured). Am wondering how to solve this and move forward? 15.7.7 is definitely downloaded via OpenCore but am stuck at this screen. [link] [comments] |
![[link]](https://i.redd.it/x9190zgh598h1.png){kind=link}
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