iPhone in boot loop when charging

Hey!

So my Iphone 4 fell in water and now it is in boot loop. It actually doesn’t work without charging and when plugged into charge, it starts to boot loop. I don’t need the phone, but I have a lot of old pictures of my children in it. I tried Itunes update( I can get it in itunes mode) and all the popular programs that recover files or flash the Iphone with keeping the files. I tried the home button and power button techniques but nothing seems to work.

Can someone tell me what actually the problem is?