Disabling acpi when booting from iso?

I'm attempting to boot from a FreeBSD 11.2 DVD iso and receive never-ending acpi errors. How do I disable acpi?
I've tried entering 'unset acpi_load' from option 3 without success.
 
Thank you, but I'm still having problems. I've tried set acpi_load="NO" followed by 'boot' at the OK prompt. Is that correct? I've also tried the command with a lower-case "no".

After trying both I still receive endless ACPI errors. I see older versions of BSD offered a "Boot BSD with ACPI disabled" option but that's apparently no longer available.
 
I found 'boot -m' allows me to boot. I tried that before posting but assumed it didn't work as I was taken to the mascot/logo page, which never progressed. However, I downloaded 13 and waited - success. It may also have worked with 11.2 had I waited longer.
 
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