Galaxy S25 Ultra: inaccurate fingerprint reader and unstable camera – how to fix these issues?
In 2025, the Samsung Galaxy S25 Ultra was supposed to represent the pinnacle of Samsung’s expertise. With an ultra-bright AMOLED screen, high-end performance, and AI-powered photo sensors, on paper, it had it all.
However, on Reddit, YouTube, and Samsung community forums, a different story is emerging: some users are complaining about a temperamental fingerprint reader and an unstable camera that is sometimes blurry or slow to activate.
Here is a comprehensive, well-argued, and ready-to-publish guide to understanding these issues… and, more importantly, how to solve them.
Galaxy S25 Ultra fingerprint reader: why does it malfunction?
The Galaxy S25 Ultra features an ultrasonic sensor under the screen, a technology that is supposed to be faster and more secure than older optical sensors.
The most common complaints
On Reddit (r/Samsung and r/GalaxyS25), several users claim:
“I have to place my finger on it three times before it works.” “
“Since the last update, my fingerprint is only recognized half the time.”
On Samsung forums, some users mention:
- Random recognition
- Slower unlocking than a Galaxy S23 Ultra
- Poor detection with a protective film
Why does this problem occur?
Incompatible screen protectors
Ultrasonic sensors are sensitive to:
- The thickness of tempered glass
- The presence of air bubbles
- Low-end screen protectors
Many negative reviews mention the installation of new tempered glass just before the problem appeared.
Poorly registered fingerprint
If the fingerprint was registered:
- With dry fingers
- With low pressure
- Before a system update…
recognition may become less reliable.
Flawed software update
As is often the case with Samsung, some One UI updates can impact biometric performance.
Users on X (formerly Twitter) have reported:
“Since the November 2025 patch, my sensor has become slow.”
How to fix the fingerprint reader problem?
Solution 1: Delete and re-register fingerprints
- Settings
- Security and privacy
- Biometric data
- Delete fingerprint
- Re-register by pressing firmly
Tip: Register the same finger twice to improve accuracy.
Solution 2: Enable touch sensitivity
Settings → Display → Touch sensitivity → Enable
Ideal if you use a screen protector.
Solution 3: Test without a screen protector
Temporarily remove the tempered glass to check if that is the cause of the problem.
Solution 4: Install the latest update
Settings → Software update → Download and install
Samsung regularly fixes these issues with patches.
Unstable camera: blurry images, slow performance, and app bugs.
Another issue that has been reported: the camera.
Some users have mentioned:
- Blurry photos.
- Unreliable focus.
- Camera app crashing.
- Video lag.
A YouTube comment under a test video:
“The camera is incredible… when it decides to work.”
Where does the problem come from?
Overly sensitive optical stabilization
The high-performance camera module can be:
- Sensitive to vibrations
- Disturbed by slight shocks
Software bugs in the Camera app
Updates can cause:
- Crashes
- Delays in shutter release
- Poor HDR management
Corrupted cache
A saturated cache can slow down the camera.
How can I fix camera problems?
Solution 1: Clear the cache
Settings → Apps → Camera → Storage → Clear cache
Solution 2: Reset camera settings
In the Camera app → Settings → Reset
Solution 3: Disable experimental options
Some AI modes or advanced optimization features may cause bugs.
Solution 4: Full reset (as a last resort)
Back up your data
Settings → System → Reset → Reset all settings
Should you be concerned?
It depends.
The Galaxy S25 Ultra remains a high-end, high-performance smartphone. However:
- There has been a significant amount of negative feedback on Reddit and YouTube.
- The issues seem to be mainly software-related.
- Successive updates are gradually fixing the bugs.
Verdict
The Galaxy S25 Ultra is not a bad phone.
But it seems to have suffered from a rushed launch, with software optimizations that could still be improved.
If you encounter:
- An inaccurate fingerprint sensor
- An unstable camera…
the solutions offered here will fix most cases without having to go to customer service.
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