How to fix fingerprint

@arisharishraj it would help if you can tell us what you all have already tried to fix this. You have to determine if this is software or hardware related. A couple of common things to do, is to do a soft reset first. Then check for any software updates. Make sure you have the latest software for your phone. So go to your phone's settings menu, then look for the "software update" or "system update" option. If there is an update, download and install it. Next clear the cache and data of the fingerprint scanner app. You should also remove and then add your fingerprints once more. For more on this, check Samsung's directions on here

If none of this worked, this could be a hardware issue and consider replacing the fingerprint scanner. Since iFixit does not yet have a guide for that, use something like this one Replacement sensors for your phone are readily available at many online stores. Pick a vendor that meets your expectations.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.