I want to add another Ipad which belong to my sister but she has forgotten passcode. how to i unlock it using my itune?
how to unlock a ipad that doesn't belong to me
iPad, iOS 9
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You cannot.
If it’s really the passcode (and not Apple ID password) she forgot, then:
If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
That must be followed by:
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support