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I can’t open my device.when I try to open it ..its say need to update..how to update it.

If I understand you right the device is telling you to update it. Generally with a android or Apple device you can plug them into a charger and then look in the settings and choose updates. This will require a Internet connection so make sure that WiFi is enabled and that you are connected. You might find some of your updates in the Google play store.