A forgotten or unknown iPhone/iPad passcode cannot be recovered - and neither can it be reset or modified from another device. If you see a waiting period you can wait and try again to input the correct Passcode; otherwise, the iPad must be restored.

You may find this support page to be helpful:

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

iPadOS 17 or later with a forgotten Passcode

If you have changed your passcode in iOS/iPadOS 17 and later - and have since forgotten the new Passcode - you may be able to recover access using your previous Passcode. Passcode Reset gives you 72 hours to use your old Passcode to access your device; when you access your device in this way, you must change your passcode again immediately:

Temporarily use your old passcode when you forget your new passcode on iPhone or iPad - Apple Support

If you cannot use the new Passcode Reset feature, you must use another method.

iOS/iPadOS 15.2 or later with a forgotten Passcode

Apple has introduced a procedure with which to reset an iPad or iPhone with a forgotten Passcode - allowing you to use your AppleID and associated Password to reset your device.

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

You will be able to restore data from a pre-existing iCloud backup without the use of a computer, but will require a PC/Mac to restore data from an iTunes backup.

iPadOS 15.1 and earlier - and all devices that are Disabled



If your iPhone/iPad indicates that it is disabled/unavailable/locked-out, or you have forgotten your iPad passcode, you have no alternative other than to follow this process:

If you’ve forgotten the passcode on your iPad, or your iPad is disabled – Apple Support

You’ll need access to either a Windows PC (with iTunes for Windows installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of macOS).

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Use of a PC or Mac is unavoidable. If you don’t have access to a suitable computer 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:

Genius Bar Reservation and Apple Support Options - Apple

AppleID

You may also need your AppleID and associated password. If these have also been forgotten, they can be recovered here:

https://iforgot.apple.com

To recover your credentials, you’ll need access to one of the following:

Your primary email address mailbox that corresponds with your AppleID

Any of the secondary/recovery email addresses that should be configured for your AppleID account

Any of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleID

More information about recovery of your AppleID and associated Password:

If you forgot your Apple ID - Apple Support

If you forgot your Apple ID password - Apple Support