Only works with v 1.0.7 or earlier of the eFamilyCloud app
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Install and login to eFamilyCloud (preferably in an emulator) Play Store Link
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Run the app to show the localKey for your device.
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App gathers all localKey messages from the following file:
$ExternalStorageDirectory/Android/data/com.efamily.cloud/cache/1.abj
app-release.apk is the compiled app in Releases Tab
Original idea from Exilit