Big problem of samsung sm-n910v problem

Please team, kindly assist me in solving this problem. I wanted to unlock this model {sm-n910v 5.0.1} with octopus by first dialing *#8080# and choosing the first option on the list, phone have since then being restarting. I tried to downgrade the phone, flash different firmware even the default firmware but phone still continue to restart at the point of loading application. Please kindly help me out on how to get the phone working again. I believe there should be a solution to this problem.