G925F Reset Problem

hi im having a G925f which is on 7.0.
i bypassed Samsung account with device but now its showing just 8 gb memory and many errors.
how can i reset it and can get rid of samsung account completly?


Searching Samsung modem... detected COM16
Reading phone info...
Model: SM-G925F
AP version: G925FXXU6ERC9
CSC version: G925FVIR6ERC1
CP version: G925FXXU6ERC2
Product code: VIR
Phone SN: R58G90NZYHL
IMEI: 353621072768290
Unique number: 0715F76B22B7093A
Reading IMEI... OK
IMEI: 353621072768290 (SIGN: OK)
Done with Samsung Tool PRO v.33.4