pcEgnines APU2/3/4 Firmware / Bios Upgrade in pfsense
SSH into pfsense box
Install Flashrom
pkg install -y flashrom
Get firmware from https://pcengines.github.io/
fetch https://3mdeb.com/open-source-firmware/pcengines/apu#/apu#_v#.#.##.rom
Flash firmware
flashrom -p internal -w apu#_v#.#.#.#.rom
Reboot pfsense