that's really odd - these ISOs are built/tested on an R720. Can you ensure you're on the latest BIOS (2.9.0) and try this newer 1.9 ISO - https://fohdeesha.com/docs/store/perc/perc-crossflash-v1.9.zipI don’t have any PCI cards plugged in :/
with this ISO you must ALSO disable virtualization in BIOS first, along with the other two options the guide outlines. you can turn it back on when done flashing. If you still have no luck, try a different boot method (if you're using idrac virtual media, burn a USB drive with rufus instead, or vice versa)
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