This assumes a local file such as n23ur33w.iso downloaded from the Lenovo support website (e.g. from https://support.lenovo.com/fr/en/downloads/DS502281). Use geteltorito to extract the relevant boot image from the ISO file (following the “El Torito” standard): $ sudo dnf install geteltorito ... $ geteltorito -o lenovo-bios.img n23ur33w.iso Booting catalog starts at sector: 20 Manufacturer of CD: NERO […]
