Firmware Update OpenCore

• Check which version is installed
  dmidecode -t bios
• Check if a newer version is available for the respective device:
  https://pcengines.github.io/
  Download, transfer to the target system, and unpack.
• Install flashrom on the target system
  BSDpkg install flashrom
  Fedoradnf install flashrom
  OpenWrtopkg install flashrom
• Verify that the checksum of the downloaded file matches the one on the website
  BSDsha256 apu4_v4.13.0.3.rom
  Linuxsha256sum apu4_v4.13.0.3.rom
• Flash firmware
  flashrom -w apu4_v4.13.0.3.rom -p internal