Update BIOS on ThinkPad X-series without CD-Drive

This is just a short post about upgrading the BIOS on a ThinkPad X-series machine.
I used method 4 in the following guide: http://www.thinkwiki.org/wiki/BIOS_Upgrade/X_Series

But next time I will probably use this:

http://www.math.ohio-state.edu/~easwaran/tech/bios_updates.html