Why does my phone keep vibrating

I have an old J2 prime and I just turned the knox security on it and it did it's restart and now it's like constantly resetting the screen turns on with no logo vibrates and then turn back off, I have already tried doing the volume button trick nothing I was going to give this phone to my grandpa so he could video call us any suggestions?

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What happens if you hold volume down+power for a few seconds?

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@andrewsawesome nothing happens the phone just continues to reset

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