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macOS 15 Sequoia on Unsupported Macs Thread

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
MacUser in SC said:
Hi Houser. I see the "MacOS Installer with the double hard drive icon" and the Macintosh HD- Data" icon if I hold the Option" key, right after startup. If I choose the "Macintosh Installer" I can not go into "safe mode", no matter how I try it.
The progress bar remains at the start up point and does not continue. Thanks a lot for the suggestion, though.
Click to expand...
Have you tried starting from the "MacOS Installer" ?

If that does not work I think I may have seen that many times and I believe the incorrect -data naming of that partition indicates a failed install and I would think that might suggest you need to start from scratch with a new install.
 
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MacUser in SC said:
Hi Houser. I see the "MacOS Installer with the double hard drive icon" and the Macintosh HD- Data" icon if I hold the Option" key, right after startup. If I choose the "Macintosh Installer" I can not go into "safe mode", no matter how I try it.
The progress bar remains at the start up point and does not continue. Thanks a lot for the suggestion, though.
Click to expand...
Actually you can: select the installer icon, press shift, hold shift and press enter.
 
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MacinMan said:
Holding ESC on boot invokes open core, the option key does the Apple boot picker. I just locked it up and double checked for myself.
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Interesting. I never knew there was a difference. Using option is all I've ever used to get the boot picker and I've run that hide boot picker setting as long as I've used OCLP because I don't like the extra delay.
 
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Kevo said:
Interesting. I never knew there was a difference. Using option is all I've ever used to get the boot picker and I've run that hide boot picker setting as long as I've used OCLP because I don't like the extra delay.
Click to expand...
The difference seems to be, when you hold options, and you select the OpenCore boot loader, you still can't pick which drive to boot from under OpenCore, if the settings are set to hide boot picker. Holding ESC, brings up the OpenCore boot loader itself so you can pick from within it what to boot from.
 
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I installed macOS Sequoia 15.6 successfully on an external flash drive off a 2015 MacBook Pro 15" (MacBookPro11,5) with OCLP 2.4.0. It installed cleanly and I applied the post-install patches with OCLP. The full installation uses about 24GB.

The only issues I encountered were:

1. Testing Migration Assistant from macOS Monterey 12.7.6 (it doesn't work at all and damages the 15.6 system so it can't start up - I reinstalled 15.6 using another USB drive). Migrate your data manually as suggested.

2. Running Swift Playground 4.6.4 - Get Started with Code (and Learn to Code 1) - running the tutorial gives an error: "There was a problem running this page. Check your code for problems. If you are stuck, start over to delete all of your changes on this page and try again." Something in the Swift Playground code breaks.

I installed Microsoft Office, LibreOffice, most of the Adobe Creative Cloud applications, Xcode, GarageBand, and iMovie without any problems and they all seem to work without issues.

Some apps have a blurry-looking menu bar - I think macOS is trying to upscale or downscale the visual elements there, possibly related to graphics switching.

I'm testing Time Machine on a hard drive and it seems to be fine.

I'm extremely impressed by how well everything works and thank you very much to the development team and community!
 
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MacMorrison said:
1. Testing Migration Assistant from macOS Monterey 12.7.6 (it doesn't work at all and damages the 15.6 system so it can't start up - I reinstalled 15.6 using another USB drive). Migrate your data manually as suggested.
Click to expand...
What I experienced in the past regarding Time Machine and Migration Assistant in my MBP11,2, Sonoma at the time, was that the migration did not work either. Before the MA finished the analysis, I started the migration.
Then I tried a second time: this time I waited for the Migration Assistant to find out everything backed up on Time Machine. It took more than two hours for it to complete, but once it completed, I started the migration and it was successful.
I understand your case is different (Monterey to Sequoia), though but if you did not wait for the analysis to complete, it is worth trying.
 
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Thanks! I did wait for Migration Assistant to finish the analysis - I usually do.

It might have worked if I just transferred the data (and not apps or system settings), but I left everything checked, just to test it.
 
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MacinMan said:
The difference seems to be, when you hold options, and you select the OpenCore boot loader, you still can't pick which drive to boot from under OpenCore, if the settings are set to hide boot picker. Holding ESC, brings up the OpenCore boot loader itself so you can pick from within it what to boot from.
Click to expand...
I just always hold option again if I end up picking a drive that has multiple boot options from the first list of choices. Never had any issues getting to what I needed to boot that way. If ESC lets you pick from all the options on all drives at once, that would be faster. I'll try to remember to hit ESC next time, but I'll probably forget. 🤣
 
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