YouTube offers video for this
https://youtu.be/QjrpCFLEgBc If you don't remember the passcode, you can follow the instructions on this video posted on YouTube... If you search with relevant keywords, you will find more help videos.
I agree with doing it yourself, doesn't cost anything. I have done this myself
You can reset to factory default settings yourself. Google your question, and someone will have posted detailed instructions.
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