Hello., i've tried this for my Vivaz U5i sony ericsson. use thirdparty file managers like Xplore or others that has an option to show you hidden files. then follow the steps of @oldturkey03 . never update Xplore because i can't see again mmcstore file after update. now i got 2 mmory cards cannot be used bcoz of password. my Vivaz has now a broken resistive touch. but anyways goodluck guys :)