Fingerprint Sensor Flex
Samsung Galaxy A21s Fingerprint Sensor Flex Replacement
- Fits
- Samsung Galaxy A21s
- Fixes
- Dead sensor
- Quality
- Brand new, OEM quality
- Fitting
- Professional install
Overview
What this part is
The Samsung Galaxy A21s has its fingerprint sensor on the back of the phone. The sensor is joined to a thin flex cable that plugs into the main board. A cracked sensor surface, a torn flex or liquid damage can stop it reading fingers at all.
This part is the sensor with its flex cable, supplied in four colours so it matches the back cover. After fitting, delete your old fingerprints and register them again in Settings › Security. Your PIN, pattern or password still unlock the phone while you do this.
Compatibility
Specifications and compatibility
- Part
- Fingerprint Sensor Flex
- Compatible with
- Samsung Galaxy A21s
- Model numbers
- SM-A217F
- Does not fit
- Galaxy A21, Galaxy A20s or any other model
- Fixes
- A fingerprint sensor that does not respond, fails to read or is cracked
- Does not fix
- Screen, battery, main board or software faults
- Quality
- Brand new, OEM-quality fingerprint sensor with flex cable for the Samsung Galaxy A21s. Tested before dispatch.
- Brand
- Unbranded, compatible with Samsung Galaxy A21s
- In the box
- 1 × fingerprint sensor with flex cable in your chosen colour.
- Colour
- Black, Blue, Red or White
- Installation
- Professional installation recommended
- Supplied by
- Supreme Phone Parts Ltd, Manchester, UK
Before you order
Is this the right part?
Signs it needs replacing
- The sensor does not react when you touch it
- Fingerprints fail to register or match
- The sensor surface is cracked or dented
- The fingerprint option has gone from Settings
How to check your model
Open Settings › About phone. The model name should read Galaxy A21s and the model number should start SM-A217, not Galaxy A21. Samsung model numbers start SM-.
The Galaxy A21s (SM-A217F) is a different phone from the Galaxy A21. Check the name includes the "s".
Professional installation
How a technician fits this part
- Power the phone off and remove the SIM tray.
- Warm the back cover edges gently and lift the back cover off with a thin pick.
- Remove the screws and inner cover, then disconnect the battery before anything else.
- Unplug the old sensor flex and ease the sensor out of its housing.
- Fit the new sensor, reconnect its flex and the battery, then test it before closing.
- Refit the inner cover and screws, fit the back cover with new adhesive, then register your fingerprints again.
Check that the part matches the device before fitting it or removing any adhesive backing. Once a part has been fitted, it cannot be returned for a change of mind. Faulty parts are always covered.
FAQ
Frequently asked questions
Will this fit my Galaxy A21s?
Yes, if Settings › About phone shows Galaxy A21s (model SM-A217F). It is not listed for the Galaxy A21 or Galaxy A20s.
Does it fit the Galaxy A21?
No. The Galaxy A21s (SM-A217F) is a different phone from the Galaxy A21. Check the name includes the "s". Check Settings › About phone before you order.
Do I need to register my fingerprints again?
Yes. After fitting, delete the old fingerprints and add them again in Settings › Security. The phone links saved prints to the sensor, so the old ones may not match.
Is it made by Samsung?
No. It is a brand new, OEM-quality part made to fit the Samsung Galaxy A21s, and it is tested before dispatch.
Should I fit it myself?
We recommend professional installation. The Galaxy A21s has to be opened with heat and a pick, the battery must be disconnected safely, and the flex cables are thin and easy to tear.
How quickly will it arrive?
Orders placed before 4pm on a working day are dispatched the same day from Manchester by Royal Mail Tracked. Delivery is free on UK orders from £5.
Prepared by the Supreme Phone Parts team, Manchester. Last updated September 2026.