Q: im trying to update to an IOS9 but my iphone 6 plus gets stuck on the apple logo loading bar. it gets halfway then stops and on the computer screen something pops up and says (the iPhone "iPhone" could not be restored. an unkown error occured (53).)

Hello Bi0nicbrad<

Sorry to hear that you are experiencing issues with updating your iPhone 6 Plus to iOS 9. Let's see if we can get it sorted out.

Based of the error code that you are seeing in iTunes, it looks like it might be a hardware issue. Keep trying the restore and check for any security software that could be blocking iTunes access to it's servers. Take a look at the article below and I have also highlighted the section that you needed to look at below. 

Get help with iOS update and restore errors
https://support.apple.com/en-us/HT204770
 

Check for hardware issues

Errors: 1, 3, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 53, 56, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.

Your device or computer might have a hardware issue that stops the update or restore from completing.

1. Check that your security software and settings aren't blocking your device from communicating with the Apple update server.
2. Then try to restore your iOS device two more times while connected with a cable, computer, and network you know are good.
3. Make sure that your security software and settings are allowing communication between your device and update servers.
4. If you still see the error message when you update or restore, contact Apple support.

If you still see the error message, check for outdated or modified software.

Take care