Because I am using the RHEL 7, I need to update the new bios firmware from usb disk. Normally, the Lenovo provides 2 methods, update the firmware by the windows os or bootable CD. I don’t have cd reader for the laptop. So I need to update the firmware from a bootable usb disk. Thanks to TOJAJ’s BLOG.
I fellowed his instroduction. Here is details for the update.
LENOVO BIOS/UEFI UPDATE FROM USB STICK