Hi -
You always have to update your cool-er through the sd card.
Be sure to unpack the firmware update files before you copy them onto your sd card. (I've forgotten before - and trust me, it doesn't work!)
It was posted on this forum yesterday that there is a new update, in a downloadable zip folder - the previous update was in a .rar file.
I've found the youtube demonstration very helpful:
http://www.coolreaders.com/fw.asp
good luck!