iPhone doesn't charge, boot or restore

A customer bought an iPhone abroad that was refurbished. Used it for 2 months and now it’s not working. It suddenly died on her during usage. I tried charging it and it switches between 1A, 0.4A and 0A. Every 2 seconds it switches. I can put it in DFU mode, but in itunes it gets stuck on “waiting for iphone”and in 3utools it gets stuck at 11% with the error ünable to switch DFU mode to recovery mode” when I try to restore it. I see UV glue on the audio IC so that should have been jumped. I tried another diplay, batter and dock connector.

I don’t know if I should take in this iPhone, because someone already repaired it. It sounds like the USB IC is faulty.