The Apple iPhone 7 has anti-theft and may affect how you are able to master reset the device. To use anti-theft, follow these steps:
- On your device’s Home screen, tap Settings > iCloud.
- If you’re asked to sign in, enter your Apple ID, or if you don’t have one, tap Get a Free Apple ID then follow the instructions that appear.
- Tap to turn on or turn off Find My iPhone.
- If turning on, tap Allow.
- If turning off, enter your Apple ID password and tap Turn Off.