It has to do with an old amd cpu bug.To work around it, create this file: /boot/loader.conf.local Inside put this:hint.hpet.0.clock=0hint.ahci.0.msi=2hint.sdhci_pci.0.disabled=1hint.sdhci_pci.1.disabled=1Reboot... and voilá!
Try to enable UEFI BOOT from BIOS and disable win7/win8 legacy.This works for me.Miro
You didn't say anything about this:https://forum.opnsense.org/index.php?topic=11674.msg53090#msg53090
Latest BIOS ?The commands _should_ work, but in any case you could try reinstalling 18.7, configuring it and then attempt an upgrade.
Maybe try Franco's "Test" Image per this thread https://forum.opnsense.org/index.php?topic=11419.105 and see if that helps