How to repair an iPhone 7 which is in bootloop?

Hi,

I have an iPhone 7 which is blocking in bootloop. I tried to open it, check if connectors are good, but the flex of the charger port seems to be a little bit bent. But, when I plug it on my pc, the phone start but same thing, he starts and restarts endlessly (white screen with Apple Logo and black screen etc ..). But, the PC doesn't recognize the iPhone, the phone is not recognized by iTunes or Dr. Fone so I can't restore it.

Please if you have any idea, let me know !