Thread: New version of DRM removal tools ("DeDRM")
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Old 02-28-2019, 12:05 PM   #993
pwalker8
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Quote:
Originally Posted by ratinox View Post
Yes, with pain. The older OS drive needs to be removable, and it must be removed from the machine when the newer OS is booted. Otherwise the newer OS will quietly run "upgrades" to the filesystem which the old OS will not know about and can make the old OS unbootable.

There may be other problems. I don't know. I only found the filesystem problem the hard way and gave up on dual-booting after that.
I just bought an older mac mini and keep that at Sierra. It's a lot easier than dual booting and two year old mac mini's are pretty cheap.
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