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Do a factory reset to change your phone back to its original state before the first time you turned it on. If you’re passing your phone on to someone else or your phone has a persistent problem that cannot be solved, you can perform a factory reset (also called a hard reset).
Important: Factory reset is not a step to be taken lightly. It will remove your primary Microsoft account and you may lose data if it has not been synced. Be sure to back up any data and files you want to keep before you do a factory reset.
A factory reset may not permanently erase all data from your phone, including personal information, which may be recoverable by others.
The most convenient way to do a factory reset is via the settings.
If you can’t turn your phone on or access settings, you can still perform a factory reset by using the phone's buttons.
If your phone is lost and you can't physically recover it, you can reset it remotely using the Find My Phone service.
Note: For the Find My Phone service to work, you must have enabled Find My Phone in the phone settings, set up a Microsoft account on the phone, and the phone must be on and have a cellular network signal.