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How to open Huawei's early warning of natural disasters?

Huawei's mobile phone enables natural disaster early warning as follows:

Tools/materials: Huawei mate40Pro, HarmonyOS OS3.0, setting 1.0.

1. Turn on the phone and click the "Settings" icon.

2. Find "Emergency" and click on it.

3. Click "Natural Disaster Warning".

4. Click the gray button next to "Earthquake Warning".

5. The display of "Earthquake Warning" and "Flash Reminder" is turned on, and the operation is completed.