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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