I bought a samsung S5 and i found out later on it was locked on a retail mode version 4.1.20140515 i can red my meid and i see the 3G logo. can someone help me with master password to stop the demo mode plzzz. i cannot restart, factory reset or uninstall the app ( i get a pop up about security policy) only way to switch the phone off is to take off the battery. i tried rooting but the phone will not restart... i tried 5444 does not work. thank you