Access "locked" phone storage
Use ADB.


Connect your device to PC/Mac in Recovery mode.
Test connection. Type ./adb devices (MAC) OR adb devices (WINDOWS).
Assuming you want to download DCIM folder, type ./adb pull sdcard/DCIM &lt;optional_dir&gt;


Use ./adb on Mac and adb on Windows.

You can also download the complete /sdcard folder as a full backup.