MAC OS SONOMA WONT BOOT WITHOUT USB

Hi

I created my first Sonoma Hackintosh with a Dell Optiplex 5050 (I5-6500, 8GB RAM, 240GB NVME SSD, HD 530 graphics). All works well including audio, graphics etc, apart from that I cannot get it to boot without the USB installer plugged in, I have mounted the EFI partition on the USB copied the EFI file, removed the USB, mounted the EFI partition on my boot drive, and copied the EFI onto it. However when I restart the computer just says that there is no bootable device. Am I doing something wrong? Im new to this and so confused as I think ive done everything as I should have. Thanks in advance.

submitted by /u/Big-Negotiation2163
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