Android phone problem.?

please help me with my phone, Samsung SII LTE (shv-e110s). i can't use it anymore or should i say, i can only use it for a minute. this is what happened. I installed an app yesterday and it says it needed a permission from SuperSU(root) then i pressed "grant". after that, it just restarted. i thought... show more please help me with my phone, Samsung SII LTE (shv-e110s). i can't use it anymore or should i say, i can only use it for a minute. this is what happened. I installed an app yesterday and it says it needed a permission from SuperSU(root) then i pressed "grant". after that, it just restarted. i thought that was just a part of it but then after it restarted, after a minute it restarted again and again and again until now. I can't access cpu master pro (from antutu) and it still restarts. what should i do? please help.
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