Ive been trying to update my droid for awhile now on multiple occasions and it just wont update. when ever i try it wont allow me to update, i completely download the file and then it takes me to the installation part and about 1/4 of the bar becomes yellow and then it just turns on and says that the update has failed. i did have a rooted device but i unrooted it and after that i restored it to factory settings twice. is there something else i need to do? please help!