Curtis PLT4311 - Manual (Page 15)

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To install an APK file
This device supports third part Application Program .APK files.
From desktop, Tap to enter application menu and tap to
enter APK installer tool or;
Note: Some APK. can’t be downloaded due to the CPU limitation.
From desktop, Tap to enter application menu and tap to
enter a list of file and tap on the desire APK file to install the APK directly.