http://web.canon.jp/Imaging/eosdigital2/e3kr2_firmware-e.html This firmware update incorporates the following improvements:
-Fixes the phenomenon of shots being unable to be taken when using the remote controller RC-1.
-Fixes the phenomenon wherein the camera continues to scroll through images being played back.
-Improves reliability in communication when using some CF cards
recogido en la web de 350d.org y publicado por rodrigosan