Check your security patch level from the recovery mode
Put your device into download mode to check Security path level on the top of the screen you will see a800fxxu1aoj2
If you are trying to bypass FRP Lock using the Samsung combination file, first you have to download the Samsung combination file for your mobile. You can Download free combination files.
You can check the security patch level of factory binary level by two ways.
Check security patch level by settings
Go to settings > About phone > software information and check baseband version (n950fxxu5crha) here U5 is factory binary version.
Check security patch level by recovery mode
You can also check security patch level by recovery mode.
turn the device off and press and hold power volume up and home button
on the top of the screen, You will see PDA like (n950fxxu5crha ) here U5 is security patch level.