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On a computer or another phone, go to google.com/android/find .
After a factory reset performed through recovery or Find My Device, the phone will ask for the that was synced to the device. This is anti-theft protection. How to Factory Reset ZTE Blade X10 Pro
If your phone continues to malfunction after multiple resets, the issue may be hardware-related (battery, motherboard, or memory chip). In that case, contact ZTE customer support or visit an authorized service center. On a computer or another phone, go to google