Optiplex 990 Mojave Boot Failure

I have tried both Vanilla and Unibeast method to create the USB boot drive with Mojave + Clover. However, once I boot into the flash drive, I get a failure to boot, as if Clover isn't installed. I have also tried both UEFI and Legacy boot. Any suggestions would be appreciated!

submitted by /u/uberricelover
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