This guide installs EFW 3.0 on a CF-card for ALIX or APU2 boxes.
Download files and apps:
This guide works for a Windows computer. Doing the same from a Linux client requires different command, but the steps are the same.
If you're unable to determine the proper disk, remove the CF-card, run DISKPART and LIST DISK, and then re-run it with the CF-card inserted. The CF-card is just the disk that has been added.
Here is the original article.