How can I change or recover my Apple passcode
How can I recover or change my Apple passcode
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Your question is a little ambiguous.
Do you mean Apple ID Password, or phone passcode?
Phone Passcode - You need a computer and it will wipe the phone
If you forgot the passcode on your iPhone, or your iPhone is disabled
AppleID password - change your Apple ID password.
https://support.apple.com/en-us/HT201355
if you forgot your appleID password