It is recommended to back up and store your device photos and media files before a factory reset. You will not be able to bypass the security locked screen until you reset your device and then create a new security passcode.
You can also use our AT&T Device Support Portal by selecting the cellphone brand/model you have, then got to Tutorials & Videos > Security for additional steps.
We hope this is helpful, and have a great weekend!
Dwight, AT&T Community Specialist
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*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.