You want to update the BIOS of a PCEngines APU2 box from Pfsense? It is rather easy.
PC Engines maintains up to date BIOS of these machines at disposal here : https://pcengines.github.io
Here is for my part a very basic script that updates the apu2_v184.108.40.206.rom of the BIOS. You can easily adapt it to your needs:
#!/bin/sh # Update APU2 Bios # by Gonzague Dambricourt # Simple script without any checks, use at your own risk echo "Flash time for APU" pkg install -y flashrom rm apu2* fetch https://3mdeb.com/open-source-firmware/pcengines/apu2/apu2_v220.127.116.11.rom flashrom -w apu2_v18.104.22.168.rom -p internal:boardmismatch=force echo "Finished" exit
A better version can be found here: https://github.com/bouchecousue/PCEngines-APU2-Update-BIOS-from-PfSense