iPhone 7 Plus "Disabled"

So I replace a screen on an iPhone 7 Plus for a friend. After doing so the message that the iPhone has been disabled and I undertand that it must be plugged I to iTunes to be able to use again. Here's the tricky part that I am not sure of. Just prior to me replacing the screen, she had bought it from another friend that was not using it due to the damage and had bought a new one. When I plug it into my iTunes it does not recognize any device. Does it need to be plugged into his account? And if so, does it need to be his computer? He's given me his login info and that didn't work either.

Thanks for any help…