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macOS 15 Sequoia on Unsupported Macs Thread

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I'm having trouble with 15.8 (24H16) on each of an iMac 27" Late 2015 and an iMac 27" 2014. The update installs OK, but after applying root patches the next restart stops at about 30% on the progress bar and just sits there. Both machines - I suspect the AMD Legacy GCN patches are the problem as an old Macbook Air (2012, Intel HD4000) works fine with root patches after the install. I can revert the root patches manually after booting into recovery, but no go with root patches installed. I'd be grateful for any ideas about how to proceed - the machines are, of course, painful without the graphics acceleration.
 
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Screenshot 2026-08-17 at 17.37.48.png
 
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snapadee said:
I'm having trouble with 15.8 (24H16) on each of an iMac 27" Late 2015 and an iMac 27" 2014. The update installs OK, but after applying root patches the next restart stops at about 30% on the progress bar and just sits there. Both machines - I suspect the AMD Legacy GCN patches are the problem as an old Macbook Air (2012, Intel HD4000) works fine with root patches after the install. I can revert the root patches manually after booting into recovery, but no go with root patches installed. I'd be grateful for any ideas about how to proceed - the machines are, of course, painful without the graphics acceleration.
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I have the same issue, also AMD-related. Fails at same boot state after root patches on a 2011 15” MBP with working dGPU, 2015 15” MBP, 2017 15” MBP. Tried using older KDK and still no go. I hope there is a fix.
 
Mystere65 said:
The same thing happened to me on my iMac, but after a forced shutdown, when I turned it back on it completed everything.
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Does your iMac have AMD graphics? Curious whether this issue is restricted to AMD Legacy GCN driver support having changed between 15.7.9 (24G830) (which has a KDK) and 15.8 (which does not have a KDK yet but seems to have this boot stalling issue on both my iMacs with AMD graphics when using the 15.7.9 KDK). Force shutdown/restarting doesn't help; and both run without root patches, but as soon as the root patches are applied the problem recurs. Options seem to be either to live with snail-iMacs until Apple releases a 15.8 KDK or to wipe and reinstall 15.7.9. KDK releases for pre 26 OS's have been spotty over the last year, so who knows when Apple might release the 15.8 KDK.
 
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snapadee said:
Does your iMac have AMD graphics? Curious whether this issue is restricted to AMD Legacy GCN driver support having changed between 15.7.9 (24G830) (which has a KDK) and 15.8 (which does not have a KDK yet but seems to have this boot stalling issue on both my iMacs with AMD graphics when using the 15.7.9 KDK). Force shutdown/restarting doesn't help; and both run without root patches, but as soon as the root patches are applied the problem recurs. Options seem to be either to live with snail-iMacs until Apple releases a 15.8 KDK or to wipe and reinstall 15.7.9. KDK releases for pre 26 OS's have been spotty over the last year, so who knows when Apple might release the 15.8 KDK.
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On the 5.1 I have an RX 460
 
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Have had to completely restore Monterey and then Sequoia 15.7.8 to get into the system - OCLP on a 2015 Retina 11,5 MBP with 15.7.9 hangs - installed it twice now and ensured that the KDK 15.7.9 build 24G830 was installed - still hangs at 30%.
Unless there is a pressing need to update any longer I am now happy with a working system
 
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rob.shaw said:
Have had to completely restore Monterey and then Sequoia 15.7.8 to get into the system - OCLP on a 2015 Retina 11,5 MBP with 15.7.9 hangs - installed it twice now and ensured that the KDK 15.7.9 build 24G830 was installed - still hangs at 30%.
Unless there is a pressing need to update any longer I am now happy with a working system
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Give safe-boot a try? Or just let it boot again after a force restart. Happens often. Good luck
 
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Daniel Pascoal said:
This has happened to me as well. Try installing multiple times over the same Volume, don't erase it. Also do not select the targed drive for restart, just force reboot it. To continue the installation, on the next reboot choose the Sequoia installer that is inside the Mac, not the USB drive.

In the end you may end up with a drive name with multiples " - data - data - data". If it bothers you look up how to rename the Open Core system boot options.
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I had similar issue on my 2012 MBP with Sonoma. Had multiple drive names.. I just renamed back as normal. Had last 3 updates do similar. won't update this again... run till it dies.
 
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