Connect locked iPhone to iTunes without passcode or home button

Hi,

I bought some broken iPhones to repairing my free time and told the owners to delete the devices from their iCloud accounts so I could reset them when I repaired them.

When opening the phone (6s), there was a lot of dirt inside and it turned out the screen had been replaced a couple of times. While disconnecting the homebutton i noticed that the cable was completely ripped of the button.

I don’t want to go trough the trouble of buying a new one but I can’t reset it because its still pascode locked.

Is there another way to do so? if so how?

Thanks!