Update firmwareupdate.md

en/firmwareupdate.md

@@ -11,7 +11,7 @@ https://card10.badge.events.ccc.de/release/card10-v1.3-cccauliflower.zip
 * copy over the files you just extracted directly into the main folder
 on mac devices it is recommended to use the terminal, e.g. for the broccoli release: `cp -r Downloads/card10-v1.2-broccoli/* /Volumes/CARD10/`
 * eject your device (if you're doing this in the command line: don't forget the `sync` on linux)
-* switch your card10 on and off again
+* switch your card10 off and on again
 
 # Previous Releases
 ## Broccoli (day 1 - 19:00)