Procedure
-->Run octopus box software v.2.5.6
-->Select mentioned above device model in Software's list.
-->«Reset FRP / Reactivation / EE» button.
-->Select second Reset FRP/Reactivation lock method (press «For devices with UFS memory chips» button).
-->Put the phone into Download Mode (power off the phone, press and hold "Volume-" + "Home" + "Power ON" buttons) and connect USB cable.
-->Software asks, disconnect USB cable and connect Samsung Micro UART cable.
-->Press and hold «Volume-» + «Power ON» keys for 15-20 seconds, Software will automatically close wizard window and do reset FRP/Reactivation lock.
Screenshot
-->Run octopus box software v.2.5.6
-->Select mentioned above device model in Software's list.
-->«Reset FRP / Reactivation / EE» button.
-->Select second Reset FRP/Reactivation lock method (press «For devices with UFS memory chips» button).
-->Put the phone into Download Mode (power off the phone, press and hold "Volume-" + "Home" + "Power ON" buttons) and connect USB cable.
-->Software asks, disconnect USB cable and connect Samsung Micro UART cable.
-->Press and hold «Volume-» + «Power ON» keys for 15-20 seconds, Software will automatically close wizard window and do reset FRP/Reactivation lock.
Screenshot