Hello Jabob. If your iPhone 6 is disabled, the only way to unlock it is to completely erase and reset it. If you have a backup, you'll be able to restore it, otherwise you'll lose all of your data. There is no way to unlock a disabled iPhone unless you use the correct passcode or you erase it. And the following guidance will show you how to unlock a disabled iPhone with iTunes.
Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by clicking "Back up Now" in the Summary window.
In the Summary window, you can see the option "Restore iPhone". Click it to reset your iPhone. Once the reset process is complete, you'll be taken through the iPod's initial setup process.
Select "Restore from iTunes backup" during the setup process. This will load the backup that you created so that all of your data is restored.