If you do not have Google account, you have to perform factory reset. Resetting will DELETE ALL DATA, including downloaded applications, and reset the phone back to the state before you turned on the phone for the first time.
1 Switch on mobile "mobile show Screen lock"
2. Then go to emergency call press this code *#*#7378423#*#*
after pressing key display show four option
service info
*service setting
*service texts
*customization setting
3.choose "customization setting"
4.then press "reset customization" phone will reboot & reset
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