Important!You need to unlock only when u meddle with gdfs file system of your phone which is specific for your phone exclusively. If u want to do anything to your phone back up gdfs in xss++ flash software, keep it in safe file by giving it a file name so that it is easily identified by u. you may need it when some thing goes wrong. just watch out tutorials from justme, topsony,tanzeel and others. if u dont read and flash straight away u will brick equivalent phone and dont blame anybody for your costliest phone paper weight. I am already suffering now as i did not backup gdfs. Do it cautiously what ever u do. Just read posts befor posting! many solutions!