Loosing my Magic Mouse after 10.10.3 update

hi andrew_sib, yesterday i had similar issues with my magic mouse being non responsive after the latest update to os x 10.10.3, specifically with the secondary click (right / left) and other features not functioning...i was given some great advice by some of the apple community family, however, the issue persisted. i called apple support and they were unsuccessful in correcting the problem...i decided to arrange an appointment with the genius bar...through some diagnostic testing of my macbook pro and the mouse the apple technician found that certain essential files and folders were missing from my mac during the update which cause the issue with the magic mouse...i was able to get the mouse fully working again after we extracted the firmware (os x 10.10.3 Yosemite) and setting the macbook pro to its original factory settings...make sure you backup everything via. time machine first...the next step would be re-download os x 10.10.3 yosemite followed by the startup procedure for logging in to the macbook pro (ie. computer password, etc..) its takes about 30 minutes for this to be completed. after your everything is completed, go into system preferences and check both the bluetooth icon (make sure that the mouse is paired with bluetooth) then check mouse icon (make all the gestures are checked). the mouse should be fully functional again. hope this is helpful...if not make an appointment with the genius bar! peace!