Lenovo distributes BIOS updates as .iso files (example) that are supposed to be burnt on a CD and booted. Burning it to a CD worked and booted correctly, but now I want to use a USB stick instead (because I don't trust my CD drive), how to create this USB stick using Ubuntu?
There are many tutorials explaining how to create bootable USB sticks from Linux-based ISOs (using UNetbootin and similar, they create Linux-related files at the root of the USB stick) and from Windows-based utilities (with FreeDOS and similar). I believe neither are solutions here as the BIOS update ISO file is not Linux-based nor DOS-based (mounting the ISO does not show any known filesystem)
# dd if=/path/to/iso of=/dev/yourusb bs=4M. WARNING: Your USB will be ERASED. Also please double check the path to your USB block drive