How do I erase my iPad before sending for repairs
How do I erase my iPad before sending in for repairs
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This support page provides guidance for preparing your device for repair/service:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support
This additional support page provide information about de-activating the Activation Lock - and properly erasing all data:
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support