if your device is frp/reactivation locked this method doesn't work for you
what your need twrp recovery for your device model and supersu.zip file depend on your andriod version
first
flash twrp (sometimes u have to tick auto reboot option in odin)
second
second boot in to recovery n go to in sequence of
1...advanced
2..file manager
3..data
4..system
@ system folded find
locksettings.db
locksettings.db-shm
locksettings.db-wal
delete them one by one
i test my self on
galaxy s6(sm-g920)andriod version 5.1.1(OJ7)
galaxy s6 edge(sm-g925t ) andriod version 6.01(4EPF1)
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