http://direct.motorola.com/CHI/SoftwareUpdateSummary.asp?country=CHN&language=CHI&web_page_name=SUPPORT&strCarrierId=&strPhone=MileStone%20XT502%28Android%202.2%29&strCable=Mini%20USB%20Data%20Cable&strURL=No%20URL
官方没有刷机包,刷机后不再保修,其实不算难,在安桌或者Xt502论坛有…