hello wqhyw2 :
i download your efi files in my usb flash disk [efi]patition to install mojave 10.14.1 on my deskmini 310 (i5 8400 );
and first installed to ssd well
and loop reboot the same problem as your .
[Fixed. Change ssd to apfs, then everthing is ok.]
and i installed patition as...