How to reset an iphone's password without the original password?

My phone got stolen at school and I got it back (really long process) and now I don't know the password. Is there any way that I can reset it manually without the password

Yes. Connect the iPhone to the computer you originally linked it to (with iTunes) when you first got the phone, and it should take away the passcode/password if you sync the phone, or there will be an option to do it manually.

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