Crucial support says there is no option for people without a CD drive, but there is.
You just have to be willing to carefully follow some instructions and be sure you're not writing to the wrong disk.
(the DVDs cannot get out after inserting.) I found a lot of articles and followed them exactly, but none of them worked. Reference: This one is actually for making a USB installer for OSX.
But I thought I would be quite similar to make a bootable USB stick for updating firmware.
There is a bug report (https://bugs.launchpad.net/ubuntu/ bug/774089) going with a number of people having the same issue and most of them were able to recover, mostly thanks to this post!