It was recently discovered that all smartphones from Samsung with the ultrasonic fingerprint reader, meaning the Galaxy S10, S10+, S10 5G, Note10, Note10+ and Note10+ 5G have a security flaw that lets unregistered fingerprint to unlock the device if you use some third party screen protectors. Samsung promised to fix it and here's the first phone to get the patch - the Galaxy Note10+ 5G. Or at least we think so.
This is the second update for the series this month and this version is N976BXXU1ASJ2 for users in the UK. The patch is just 18MB big and the changelog says that it improves the performance of the fingerprint recognition although, there's no details on what exactly changes. It could be just a speed performance update rather than a fix for the security flaw.
To unlock the phone without a registered fingerprint reader requires you to install a certain gel-based screen protector that messes up with the readings. The scanner will pick up the dotted pattern of the gel instead of your finger and will unlock the screen by just pressing down with any finger.
Dont know why Samsung stuck with under screen fingerprint since google ditch both of fingerprint wither ordinary fingerprint or under screen fingerprint.