Update lenovo/thinkpad BIOS using USB Flash

  1. Download firmware in .iso format (BIOS bootable update CD)
  2. dnf install geteltorito
  3. geteltorito -o bios.img j5uj62wd.iso
  4. Plug USB flash, umount manually if mounted, find out the device name (dmesg)
  5. Write bios.img to usb flash disk, be careful about device name, for example /dev/sdb, all data in USB flash will be deleted
    dd if=bios.img of=/dev/sdb bs=1M
  6. Boot and enter Setup, make sure system can boot in Legacy mode
    UEFI / Legacy = both
    Priority = Legacy First
    CSM = yes
  7. Save and boot using USB flash


Ref:
https://workaround.org/article/updating-the-bios-on-lenovo-laptops-from-linux-using-a-usb-flash-stick/


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