iMac not letting me downgrade to mavericks via USB
56653
iMac won't boot off of Mavericks USB when downgrading from Yosemite
37306
iMac disk partion FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF and fusion drive unlinked
142758
Error while creating OS X Mavericks bootable USB
23781
Incompatible Software for next OSX?
68614
Is it possible to install an old version of Mac OS on a new Mac?
31948
Roll back from OS X Mavericks ( or any newer OS) to Mountain Lion
149786
How to restore Mac OS X on a new hard-drive?
115829
How can I synchronize my two Mac Computers?
122693
How can I upgrade Mac OS without the administrator password?
148808
Update from Mac OS X 10.6.8 to the newest version
65520
How to install Windows 10 into a 2013 iMac without using the Boot Camp Assistant, USB flash drive or third party tools?
138676
Is it possible to "hack" a MacBook so as to be able to install macOS Mojave?
153423
OS X accessing external drive
150010
Installing Mavericks on a brand new machine that shipped with Yosemite pre-installed?
98075
What is the best way to generate a Yosemite or Mavericks Install USB flash drive?
116657
Install an older OS X version on an external volume
38925
Can you update to macOS 10.14 (Mojave) without converting to APFS?