Direct answer
Fingerprint reliability changes with screen protectors, dry/wet skin, sensor cleanliness and enrollment angle. Security lockouts after restart or repeated attempts are normal.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleClean/dry finger and sensor and note whether failure is location-, finger- or lighting-specific.
Run the smallest isolation test
ReversibleRemove only a poorly fitted protector for a test and re-enroll one print from varied angles after updating.
Correct only the proven cause
ReversibleKeep a secure PIN and add another permitted finger rather than enrolling the same tiny area repeatedly.
Verify before changing anything else
ReversibleLock and unlock ten times in normal conditions and confirm fallback PIN still works.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Clean/dry finger and sensor and note whether failure is location-, finger- or lighting-specific.
What is the safest isolation test?+
Remove only a poorly fitted protector for a test and re-enroll one print from varied angles after updating.
When should I stop troubleshooting?+
Service a damaged screen/sensor or sudden failure after display replacement.
Answer for the exact device and software version shown above.