code for my iphone 7

Connect the iPad to a computer with iTunes. Hold down the power button + home button on the iPad for 20 seconds or until you see the iTunes logo. When it says 'There is a problem with this device....' click Restore.

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

Edit: Didn't mean to post twice, sorry!

Connect the iPad to a computer with iTunes. Hold down the power button + home button on the iPad for 20 seconds or until you see the iTunes logo. When it says 'There is a problem with this device....' click Restore.

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

I am guessing this: https://support.apple.com/en-us/HT204306