Depending upon the issue, use of a computer to recover access might be unoidable.
An iPad will be disabled or indicate that it is unailable if an incorrect Passcode is entered too many times.
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 unailable message or Security Lockout screen - Apple Support
iPadOS 17 or later with a forgotten Passcode
If you he changed your passcode in iOS/iPadOS 17 and later - and he 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/unailable/locked-out, or you he forgotten your iPad passcode, you he 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 more recent Apple Device App) or a Mac computer (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
Apple Devices App (Windows PC):
https://apps.microsoft.com/detail/9np83lwlpz9k?hl=en-ms&gl=MS
Use of a PC or Mac is unoidable. If you don’t he 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
Activation Lock
Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be satisfied:
Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Turn off Activation Lock – Apple Support
As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.
If you he the necessary documentation, Apple he introduced a portal though which you may be able to request release of an Activation Lock:
How to remove Activation Lock - Apple Support & start an Activation Lock support request.
AppleID
You may also need your AppleID and associated password. If these he 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 AppleIDAny of the secondary/recovery email addresses that should be configured for your AppleID accountAny of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleIDMore 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