As the batteries get older they start to degrade and affects the IPhones functionality. The process went smoothly, and I had no issues. I suspected the issue to be with the battery, because the phone used to work perfectly and I hadnt known of a battery change ever, so I got a new battery from ifixit, popped it in, and went to restore the phone in itunes. Ok, so I had this problem where my IPhone 7 would keep restarting while it was in recovery mode or it would simply not turn on after downloading firmware was complete. Doing it this way allows you to download the file prior to putting your phone into recovery mode, so it won't timeout and reboot while iTunes is doing its thing. Select the firmware file you downloaded from and the phone should restore. On Windows, hold down the shift key while clicking 'Restore iPhone.' There should be two buttons on the righthand side of the iTunes window marked 'Check for updates' and 'Restore iPhone.' On Mac, hold down the 'alt/option' key while left-clicking on 'Restore iPhone.', and you'll have the option to choose the firmware file you wish to restore with.

Cancel any dialog options asking if you want to restore or update until you are at the phone's landing page. Put your phone into recovery mode and connect it to your computer.

links to Apple's firmware servers, so the latest versions are digitally signed, which means you can use them in iTunes. Go to, locate your model and download the latest IPSW (Apple's iOS firmware file type).

Thankfully, you can download the firmware file through your browser and select it manually in iTunes, so the phone doesn't have to wait for iTunes to download 2.5+ GB. For some reason iPhones have an annoying habit of rebooting while you're waiting for the firmware file to download.

Reiboot recovery mode