I replaced the screen with another LCD Digitizer on the I phone 6 plus. Kept giving error code 53 and hanging in the middle of the download. I read on forums to put original screen back on and then try to update. Now I am receiving code -18. There is no help for the minus (-18) on any help from Apple or google that I can find.

I have no firewalls

I have updated my computer

I have the correct data cable

I have cleared all cache/cookies

I have uninstalled and reinstalled I tunes

I have the latest updates on my computer and I tunes

I have done the same process on 2 different computers and come up with the same -18 code.

I have went back through the Iphone 6 plus and made sure all connections are secure

I have pressed the power but to release the power with the battery disconnected on each occasion

I am at a loss on what to do, I need some help.