Q: Error 14 iphone 6, while updating... tried switching between different apple cables etc..

Get help with iOS update and restore errors - Apple Support

Check your USB connections

If you see error 4005, 4013, or 4014, learn what to do. If you see one of the errors below, you might have a USB connection issue:

• 13, 14, 1600, 1601, 1602, 1603, 1604, 1611, 1643-1650
• 2000, 2001, 2002, 2005, 2006, 2009
• An error message that includes, "invalid response"

Use these steps to see if the issue is with your USB cable, USB port, or computer. Try again after each step:

1. Use the USB cable that came with your device. If you don't have it, try a different Apple USB cable.
2. Switch to a different USB port on your computer. Don't plug into your keyboard.
3. Plug into a different computer.
4. If you still see the error, you can check for other USB issues, issues with third-party security software, and issues with hardware.

This problem is often caused by anti-virus software. Disable or completely remove any antivirus software you have installed and try again.

Kaspersky is especially bad about this and in the past, it had to be completely uninstalled to overcome the problem.