iPad with no know passcode was a gift
How can I create new passcode? Only own iPhone and second iPad.
iPad Pro 11-inch Wi-Fi
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Request to the persoon who gave you the iPad to unlock the iPad.
That person has also to read this Apple article: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT201351
Each Apple device is linked/associated with an Apple ID of the person who did the setup.