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So basically i have a MacBook Pro 2014 that I replaced the SSD from a MacBook Air of the same year. I tried to install macOS Catalina on it (as a HFS+ drive) and it installed and then the MacBook doesn’t detect the drive to boot off of. Is there any way to fix it? (I can reproduce this when I try to install OS X Yosemite on the drive as well)
the OS detects the SSD. the boot menu will not.
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Mojave and onwards will only install APFS on the boot drive. HFS+ will not support Mojave or Catalina.
In addition the systems firmware needs to be updated to support APFS as well, if the system was not properly upgraded to the needed firmware you can find a drive which you expect to work won’t!
So to properly set this up you need to use the OS recovery services to reformat and install the older macOS to then upgrade the different OS versions to Catalina Vs jumping directly to an SSD which was setup off another system.
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I tried to install Yosemite onto the SSD and the same issue arised. I tried to install High Sierra onto an external hard drive that I had lying around in hopes to upgrade the firmware, but then it tells me that it couldn’t read the firmware. Is there another issue then?
I would restart the system and just use the internet recovery pressing the Shift, Option, Command (⌘) and R keys.
As explained here: How to reinstall macOS from macOS Recovery Make sure you deleted all partitions and reformat the drive before you run the install using the recovery menu option Disk Utilities
Then upgrade again using Option-⌘-R after you verify the system is working.
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