Ddos 
If you are using an M3 Ultra Mac Studio, you may wish to postpone upgrading to macOS 26.0 Tahoe, as multiple users have reported errors during installation that ultimately cause the upgrade to fail.
On Apple’s official forums, users have already submitted feedback describing the issue: the upgrade process proceeds smoothly until the very final stage, where an error appears. The Mac then reboots and reverts to version 15.7.
The root cause appears to lie in a flaw with Apple’s Neural Engine driver. During installation, when the setup attempts to load the new Tahoe kernel driver for the Neural Engine, a hardware check fails, triggering the rollback.
Apple has begun contacting affected users to collect kernel crash logs in order to investigate the underlying cause. Analysis and the release of a fix may take some time, so M3 Ultra Mac Studio users are advised to wait for an updated version before attempting the upgrade.
Interested readers can follow the discussion here.
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