STOP: Before doing anything that might cause data loss, make a backup of your iOS device to either iCloud, your computer, or both for extra security—> How to back up your iPhone, iPad, and iPod touch - Apple Support Check compatibility: On your iPhone 6s and earlier, including iPhone SE (1st generation) Press and hold both the Home button and the side button or the top button until you see the Apple logo. If your phone doesn't turn on, follow these steps to check your hardware and charge your phone. You might need to charge for up to an hour.

Understanding the Context