Factory Reset of IPad
Can I reset my iPad to factory settings without the original apple ID?
iPad Air 2 Wi-Fi
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yes Restore your iPhone, iPad, or iPod to factory settings - Apple Support
but
if it has activation lock then that is not really on
the ipad it's a theft protection measure on apples servers
it needs to be removed
How to remove Activation Lock - Apple Support
if you don't know your appleID
if that does not help you then you
need the assistance of apple
Get Support (apple.com) and or Genius Bar Reservation and Apple