You can use Google /Samsung account to unlock the phone. If you forget your account detail somehow and don't want to factory reset causing the data loss, you can only use the Broken Android Data Extraction to unlock your phone.
Here comes more detail.
TIL How to Unlock Android Phone Password without Factory Reset
How to Unlock Samsung Phone without Password
Broken Android Data Extraction Fix Error Recover Data from Broken Android
SOURCE: Forgot password samsung GT-E1205T phone. I ask for help, how to open it.
Factory reset
Testimonial: "how do i do the factory reset"
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