Factory reset?

Hi there fellas,
i bought an used flipper zero and want to factory reset it so that i may can see the intoduction of the dolphin again (i am told that there is one…).
Is there a way to do that?
Thanks for an answer in advance


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I have tried to do the factory reset because I forgot my pin however after about 15 seconds of holding the up and back buttons it just goes to a screen that say wrong pin.

Video link show how to get flipper in dfu mode.