Android 7.1.1

What problems will occur if I go back to Android 7.1.1? Is there a Bluetooth problem? Or SIM card 1 does not call?

Android 7.1.1

ni.ma ni.ma
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What problems will occur if I go back to Android 7.1.1?

Is there a Bluetooth problem?

Or SIM card 1 does not call?

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