If you are currently trying to fix a locked smartphone, tell me the you are working on, and I can give you the safest recovery options available for it. Share public link
The process generally involves exploiting "shortcuts" to enter the device's settings and add a new Google account.
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Proceed through the setup. When it asks for the PIN/Pattern, enter the one you created in The "Google Sign-in" screen should now show a Important Security Note Factory Reset Protection