Erase Data
How do I erase data from an iPhone X that has a shattered front and back screen before sending it back to the provider?
iPhone X
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Charge it (if you can), power it on (if you can), and then (if you can) remotely reset it from iCloud.
Click or tap on the following blue-text link: Erase a device in Find My iPhone on iCloud.com - Apple Support
If the iPhone is bricked, your password or passcode is what protects your data.