@deeveedee Sorry to trouble you again, High Sierra has been successfully installed and can now enter macOS normally. But I encountered a problem, when I replaced the EFI file in the macOS system disk and tried to boot it from the system disk, I couldn't succeed. The phenomenon is that the Apple logo appears without a progress bar. Using a USB flash drive or optical drive with a disk slot can boot into the system normally. I don't know if you have a solution? I noticed this phenomenon when installing High Sierra. When I copied the custom EFI to the USB installation disk, it also couldn't start. The phenomenon is the same as above. I used the Optical drive slot disk to boot the disk and installed the image on the USB drive to the main disk. Looking forward to your reply, thank you！
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