SM-G920F Samsung Account and IMEI NULL

Welcome to Octoplus/Octopus Box Samsung software version 2.5.4
Platform: Samsung Android
Selected port: COM10
Selected model: SM-G920F
Reading info, please wait...
Please, press "OK" button on the phone to allow USB debugging..
Detected phone model: SM-G920F
Firmware compiled date: Wed Jun 8 17:28:20 KST 2016
PDA version: G920FXXU3DPFJ
CSC version: G920FOLB3DPFJ
SW version: unknown
Phone SN: RR8G500RHBD
Android version: 6.0.1 (MMB29K)
Sales code: XID
HW platform: exynos5
HW Chip: exynos7420
HW Modem: unknown
Security patch level: 2016-06-01
SIM 1 status: not ready
Codename: zerofltexx
Performed by 2.5.4 Software version.

after try downgrade nougat to marshmallow, i have no imei n Samsung account lock...

please help me what should i do

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