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most Samsung devices (with the exception of the cheapest entry-level devices) have a fingerprint sensor built in that can be used to unlock the device. setting up the display lock with fingerprint always requires a secondary lock such as a PIN, password or pattern. even if these are hardly ever or never used, they should be well remembered. if the fingerprint cannot be scanned or the security settings need to be changed, the PIN/password/pattern is required. any finger can be used to set up the fingerprint.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Biometrics and security
Step 3: Tap on  Fingerprints
Step 4: Enter the current  Pattern ,  PIN  or  Password
Step 5: Tap on  Add fingerprint  and follow the instructions on screen
  1. Tap on Settings
  2. Tap on Biometrics and security
  3. Tap on Fingerprints
  4. Enter the current Pattern, PIN or Password
  5. Tap on Add fingerprint and follow the instructions on screen
Download instructions?
If you need the manual often or offline, you can download it here as a PDF document for free. Download

Samsung Instructions