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install flashrom
doas pkg_add flashrom
get firmware from https://pcengines.github.io/
ftp https://3mdeb.com/open-source-firmware/pcengines/apu4/apu4_v4.11.0.2.rom
reboot into single-user mode
boot> boot -s
mount
mount -a
flash the bios
flashrom -p internal -w /home/mischa/apu4_v4.11.0.2.rom
power cycle apu