How do I wipe my data on iPad?
How do I wipe my data on an old iPad before recycling it?
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If preparing your iPad for reuse or disposal, you would be well advised to prepare it properly - as this will ensure that the Activation Lock associated with the original AppleID is removed, along with all data and other sensitive information:
What to do before you sell, give away or trade in your iPhone, iPad or iPod touch – Apple Support
