Mac OS X doesn't boot without USB.

I already did what https://dortania.github.io/OpenCore-Post-Install/universal/oc2hdd.html#grabbing-opencore-off-the-usb tells to do. I mounted the EFI, erased it and copied the EFI from the usb installer.
The usb installer with opencore does boot and boot MacOS. But MacOS itself doesn't boot (it restarts into the boot menu again).
Any ideas?

submitted by /u/Baljortar
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