Samsung g920f bootloop issue need help

Samsung G920f updated with smart switch to 6.0.1 but now phone not getting network on 6.1 tried to repaire imei with z3x but time after getting data err message can’t repair imei so when tried to downgrade to 5.1 but on 5.1 phone get stucked in bootloop also tried different kernal with 5.1 software but no luck now issue is that can’t repair imei on 6.1 v and on 5.1 imei can be repaired but stuck in bootloop badly need help .

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