iPad is on support.apple.com/restore screen
How to restore the iPad using iPhone and not laptop
iPhone 6
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Sorry, not possible.
You’ll need access to either a PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of MacOS). If you don’t have a PC or ac of your own, that of a helpful friend or family member will suffice. Alternatively, the technicians at the Genius Bar of your local Apple Store will be delighted to assist.
If you see the Restore screen on your iPhone, iPad, or iPod touch - Apple Support