So, I tried out the guide over here: [Tutorial] Add a systemd-boot loader Menu entry for a Windows installation using a separate ESP Partition, and followed the steps, and I am able to see a windows boot entry in the bootloader options, but when I click it, the screen goes black, and then reloads the bootloader entries almost immediately. Not sure what else needs to be done in order to have it actually boot into windows. Another thing, my bios doesn’t have an option for fastboot, so I have no idea whether that is actually disabled or not - but the menu option did use to work prior to the fateful bios udpate.