i believe its a hidden file, go to menu > show all files and it should pop up. if not still copy it in there and try, cant hurt, if there is a stock one, back it up to sd just to be safe
OR
I dont know if this would work but here is the trial download for ms 3.5.3 you could try your serial and then mobilesense will work
http://www.downloadplex.com/Mobile/W...le_216672.html