Hello xyounasx,
Thank you for contributing to the Apple Support Communities.
It sounds like your new iPhone 6 is starting up to a red screen, both before and after updating to iOS 8.1.3. I know it can be frustrating to have issues with a brand new device, and I recommend trying the steps below.
When starting up, you might see the Apple logo or a red or blue screen for a long time, or your device might restart again. Try these steps:
- Make sure that you have iTunes 12 or later on your computer.
- Put your device in recovery mode.
- When you get the option to restore or update, select Update. This will reinstall iOS without erasing your data.
From:
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
Using these steps to reinstall iOS can resolve this behavior or isolate it to the hardware.
All the best,
Jeremy