If your BLACKBERRY Z10 phone has slowed down considerably or isn't working properly, it may be necessary to proceed to a reset . Resetting the phone will restore the BLACKBERRY Z10 phone to factory settings and all data will be lost. It is recommended to do a backup of all data before resetting the phone.
1.Switch on the cell phone.
2.Then go to device options.
3.Select Security Options Then General Settings.
4.Next press Menu button to confirm
5.Choose Wipe handheld, and select check box of things to reset.
6.Click Continue.
7.Now type word "blackberry"to confirm.