Rebuilding Mac Mini Mid 2011

Hi All,
First time using OpenCore Legacy Patcher to install macOS on a newly installed SSD.
Instlaled OpenCore Legacy Patcher on a new macbook pro, first selecting "MacMini5,2" in settings, then clicked to "Create macOS Installer" on a thumb drive, then clicked "Build and Install OpenCore" onto the thumbdrive.
The thumb drive boots on the mini and seemingly installs macos, but upon reboot i just get the speaker making strange noises.
What am I missing?
How do i install the "Post-Install Root Patch" on the mini from the bootable thumb drive?
Many thanks!

submitted by /u/XGempler
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