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Upgrade APU firmware on OpenBSD

1. install flashrom

   doas pkg_add flashrom
   

2. get firmware from https://pcengines.github.io/

   ftp https://3mdeb.com/open-source-firmware/pcengines/apu4/apu4_v4.11.0.2.rom
   

3. reboot into single-user mode

   boot> boot -s
   

4. mount

   mount -a
   

5. flash the bios

   flashrom -p internal -w /home/mischa/apu4_v4.11.0.2.rom
   

6. power cycle apu