S6 edge dead

[ion ion1]

Hi. quick question: I have a s6 edge with 5.1.1. it was bought from uk on o2. i had it decoded in Romania, all good, except i had a message showing every 5 min that something was done to the phone and to undo the change I have to restart. it has this antivirus installed from factory and it was this that was showing the message all the time. I had all my stuff transferred from my old phone and the without realizing I restarted the phone. It gets to the logo samsung and stays there, wont start. I tried a factory reset and still don t work. should I try installing to official firmware and see or is it dead. please advise. thank you so much.

 

[Kelly Kearns]

Usually when I have seen that message it is after I rooted and before I froze Knox.