How to Fix Unexpected language selection screen during upgrade 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.
Do Not Continue If
- Do not continue if: you do not have a working EFI backup, a Time Machine backup, or another bootable macOS installer.
- Stop and capture evidence: if the machine stops booting, take a photo of the last verbose line before changing more settings.
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.
Next Action
- Test now: reboot twice, reproduce the original problem, and confirm whether the same symptom returns.
- If it still fails: record the Mac model, macOS build, OpenCore or OCLP version, GPU, Wi-Fi/Bluetooth chipset, and the last visible error.
- Read next: use the related searches below for the nearest OpenCore or OCLP fix before making another change.
Related iATKOS Searches
- OpenCore · OCLP · EFI · kexts · config.plist · macOS troubleshooting
Original Question: "Unexpected language selection screen during upgrade"
Hey folks. Care to shed a light on this one?
I'm on a MBAir 13" early 15 running Yosemite Using latest OC patcher downloaded yesterday. Want to get to Sonoma, via Monterey (2 consecutive upgrades - already did this on a 2012 MB Pro)
When running the OC patcher it can't download installers. It says: "Error - Failed to download installer Catalog from Apple". That's annoying but I found 2 ways to get around it; 1) Download an installer manually (ic found Monterey on mrmacintosch.com) and present that one to the OC patcher, and 2) make a Monterey bootable disk with OC patcher on my already upgraded MB Pro.
(Side note; this 2nd option may not be perfect because the USB is then not really created to upgrade the Mac on which it was made. But OK...)
It doesn't matter which method I use; when I boot from USB I do not get the expected screen! What I should get is a screen like at 4:39 of this YT video; https://www.youtube.com/watch?v=D8djeFJ1czU. But what I get instead is a language selection screen!
As if Monterey will just be installed anew, without keeping existing user environment!
I'm scared to continue now as I absolutely do not want to lose my current user environment on that MBAir.
Anyone got any tips? Been in the same situation?
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