Hi,
I am reading this page from nixcraft
How reliable is this procedure for Lenovo X1 5th gen laptop running Fedora Linux?
I don’t see any problem. Any thinkpad device can be updated using the method I provided in the page. Please note that you must always take some precaution as laptop might be bricked if something went wrong during BIOS update procedure. I strongly suggest that you always keep backup all important data.