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In case of Android 4.0.4 / 4.1 you should do the following steps:

  1. Settings → Apps → All. Locate the following:

    • ProtectedMediaScanner → Clear data & Force stop
    • ProtectedMediaScannerTrigger → Clear data & Force stop
    • Media Storage → Clear data & Force stop
  2. Restart your Android phone. Turn it off, then on again. Let it rest for 10-15 minutes. Afterwards your media files should be available by Gallery and Music player.