reset my old iphone
I have old Iphone 6, how can I restore the phone to the factory. as I forget the password.
iPhone 6, iOS 10
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If you forgot the screen passcode then
You need a computer and it will wipe the phone
If you forgot the passcode on your iPhone, or your iPhone is disabled
video
How to re your iPhone if you forgot your passcode - Apple Support
You still need the AppleID password even to do this