Reboot at Apple logo, or reboot when passcode is given

My gf's phone had a serious issue, regarding his proximity sensor flex. The phone rebooted all the time with red screen. We have sorted that out with the flex not connected, but now it is just rebooting all the time after the Apple logo and the iTunes restore is not helping. We have tried it with recovery and even DFU mode, nothing helps. Sometimes it is booting up, but restarts immediately after I put the passcode in.

Also tried it without battery flex from the charger, no development.

I would be glad if you could help me with this, because I haven't found such a frustrating issue with a phone like this one. Apple Store won't help,

Answer this question I have this problem too

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