How to Fix Sonoma to Sequoia (my experience) During macOS Boot or Installation
Boot failures need a predictable pass through firmware, USB, storage, EFI and verbose logs before reinstalling macOS. Most installer stalls come from firmware settings, an invalid config.plist, wrong SSDTs, bad USB mapping or unsupported storage/controller settings.
Quick Checks
- Backup current state: Save a copy of your working EFI and run a full system backup before changing settings.
- Identify hardware components: Note down your exact CPU, GPU, Wi-Fi card, and motherboard/laptop model.
- Ensure utility alignment: Keep OpenCore, OCLP, and ProperTree updated.
Fix Steps
- Create a rollback point: Make a Time Machine backup and keep a copy of your last working EFI folder before editing OpenCore, kexts or root patches.
- Boot verbose: Add
-v keepsyms=1 debug=0x100so the final visible line gives a real clue. - Check firmware settings: Disable Secure Boot and Fast Boot, set SATA to AHCI, disable CFG Lock if possible, and use UEFI mode.
- Validate OpenCore: Update OpenCore, Lilu and core kexts, then run ocvalidate or ProperTree clean snapshot.
- Recreate the installer: Use a fresh USB installer and try another USB port; older Macs may need a USB 2.0 hub for input during setup.
- Reset NVRAM: Reset NVRAM from the OpenCore picker before retrying the installer.
Verify It Worked
- Verbose boot moves past the previous stopping line.
- The installer reaches Disk Utility and sees the target disk.
- Keyboard, mouse and USB remain active during recovery.
- OpenCore picker still loads after a cold boot.
Rollback
- Restore the last booting EFI folder.
- Use the officially supported macOS installer to recover the machine.
- Do not erase the internal disk until the installer can boot twice consistently.
Related iATKOS Searches
- OpenCore · OCLP · EFI · kexts · config.plist · macOS troubleshooting
Original Question: "Sonoma to Sequoia (my experience)"
After reading multiple threads about people seeing great improvements after upgrading to sequoia, I took the chance and I upgraded on my 2013 13 inch MacBook Pro i7 with 16 gigs of RAM (the max allowable) along with a 1TB SSD so trust my machine is mint.
The performance decreased. It was not faster for me on my machine. It was slower.right clicking on desktop appeared to be snappy but overall performance was not. Everything ran slowER. Still performed decent but definitely not better than Sonoma on my machine.
After about three days, it was unbearable compared to what I was used to. so I downgraded back to Sonoma.
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