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Attempting to update BIOS using a memdisk-loaded disk image causes it to hang just before flashing.

kldload coretemp

coretemp0: <CPU On-Die Thermal Sensors> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1

Reduce ACPI version to v2.0 or v1.0 to expose thermal zone to FreeBSD.