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I am stuck. I have the Metro Stylo 2 Plus (LGMS550). I installed the attached ADB tool and enabled debugging on phone. When i install the necessary drivers, google apk and navigate to folder C:/adb and enter the command line there, I can't get passed the: adb shell sm disk-lisks step. It says error: device '<null>' not found. What am I doing wrong, please help as i need to move files to sd (im starting to regret this phone)