My beloved top of the line iPad 4 128gb/cellular is still under applecare. Running 6.1.3. It has iOS 9.3 downloaded. If I upgrade, will it stay on iOS9 or will I have to upgrade it to iOS 10, which could possibly brick it? I am tempted to take it in to Apple and see what they can do. The apps I use still work but it's time to upgrade. Is it possible to stay on iOS 9 or will the upgrade force me to sign iOS 10?