So I bought a larger capacity SSD for my Macbook Pro 2015, but unfortunately it is flashed to only be able to boot Catalina or later. Try to install Mojave or earlier by clone off an external drive, it will fail to boot. I'd rather boot internally without having to swap out my SSD. I was hoping there was a way to install High Sierra on Virtualbox, but have not yet succeeded in doing so. Is there a step by step process to do so?
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Installing High Sierra on a flashed SSD that won't boot High Sierra
- Thread starter gopher
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The earliest version supported for the Macbook Pro 2015 model appears to be High Sierra, nothing before this will be able to boot on your hardware. Instead of trying to clone a drive, try installing from a bootable USB on a clean SSD drive (you can use the Erase option from Disk Utility when you boot the USB).
This link will have the instructions and download link for Mojave from the App Store:
support.apple.com
This link will have the instructions and download link for Mojave from the App Store:
Create a bootable installer for macOS - Apple Support
You can use a USB flash drive or other secondary volume as a startup disk from which to install the Mac operating system.