According to Wikipedia and http://xorg.freedesktop.org/wiki/RadeonFeature/#index5h2 the Mobility Radeon HD 4225/4250 is a RV620 chip, so you shouldn't need the updated firmware files.
According to Wikipedia and http:// xorg.freedeskto p.org/wiki/ RadeonFeature/ #index5h2 the Mobility Radeon HD 4225/4250 is a RV620 chip, so you shouldn't need the updated firmware files.