Changes Made in Recover Mode are Lost on Restart

Hi All,

I'm trying to execute through the steps found here: spin.atomicobject.com/2018/08/24/macbook-pro-external-monitor-display-problem/

The part that's tripping me up is copying a file to /Volumes/Macintosh HD/System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac. In normal operating mode I get a "read only filesystem" error. I get the same error when booting up in recovery mode. I can use mount -uw to remount /Volumes/Macintosh HD in read-write mode, and I can copy the necessary file into the directory I need to, but when I reboot, the file is gone.

How can I copy a file to /Volumes/Macintosh HD/System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac and have it stick around permanently?

Many thanks in advance for any help on this!

Best,
Brian Eriksen
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Hi Brian,

Author of that post here. I've written a new post with updated instructions for Big Sur:

spin.atomicobject.com/2021/01/17/external-monitor-color-space-part-2-big-sur/

You may have already found the answer elsewhere by now, but in short - put your overrides in /Library instead of /System/Library. And it's no longer necessary to use recovery mode!

Unfortunately it looks like this doesn't work on ARM Macs 🤨
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johnruble
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