Please for the love of XDA

I've been trying to fix my Sprint Galaxy Note 4 for about 6 months now everyone Rom or every Factory rom I tried putting on my phone my phone always reboots after 30 seconds and it's because I went inside the hidden menu and change one of the settings that I had no business changing and I cannot get my phone just a booth at no more than 30 seconds and I was hoping if someone knew how I could fix it or if someone could please send me a backup that they've made I can take out all their files that they have any information of theirs so I can then put it on my phone and give that a try because no matter what I've tried I could not get my phone to stay but it no longer than 30 seconds and the option. I changed in the hidden menu was something that said integrate Null.Every since I turned it on my phone constantly reboots after 30 seconds any advice or if anybody could send me a backup that they have made I will be greatly appreciated because my only option left is to send it back to Samsung and try to pay them to fix it but I really don't want to do please and thank you in advance

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