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Two different facial data can be registered on the Xiaomi smartphone. 
For example, if the alternative appearance has been changed, the biometric face data can be deleted individually to register new facial data.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  Passwords & security
Step 3: Tap on  Face unlock
Step 4: Enter the current  Pattern ,  PIN  or  Password
Step 5: Choose the  Face data
Step 6: Tap on  Delete face data
Step 7: Tap on  OK
  1. Tap on Settings
  2. Tap on Passwords & security
  3. Tap on Face unlock
  4. Enter the current Pattern, PIN or Password
  5. Choose the Face data
  6. Tap on Delete face data
  7. Tap on OK
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Xiaomi Instructions