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We can play a 30-second sound to clean the Xiaomi smartphone's speaker if dust has accumulated and it has become quieter than normal.
It is recommended to shake the device during this process.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  Additional settings
Step 3: Tap on  Clear speaker
Step 4: Turn On  Clear speaker
Step 5: Tap on  Got it
  1. Tap on Settings
  2. Tap on Additional settings
  3. Tap on Clear speaker
  4. Turn On Clear speaker
  5. Tap on Got it
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Xiaomi Instructions