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Starting at the beginning, a forgotten or unknown iPhone/iPad passcode cannot be recovered - and neither can it be reset or modified from another device.

You may find this support page to be helpful:

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

iOS/iPadOS 15.2 or later with a forgotten Passcode

Apple has introduced a new 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 iPad is not recognised when connected to your computer, try using a different USB port; if your computer has both USB-C and USB Type-A ports, try using the USB Type-A port of the computer.

If difficulties persist, this support page may help with troubleshooting:

If your computer doesn't recognize your iPhone or iPad - Apple Support

If your iPad is recognised by your PC/Mac, but the restore process is failing:

If you can't update or restore your iPad - Apple Support

iOS update and restore errors - Apple Support

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

What happens when you try to restore it? You say you have tried multiple cables, but you haven’t said what happens when you try? Does the computer that you’re trying to use have iTunes for Windows installed (If it is a PC) or have the most recent of MacOS installed using Finder or iTunes depending on what version of MacOS is installed?

You should check out Writing an effective Apple Support Communities Question - Apple Support for some tips on what information to put in a question to effectively get the support that you are looking for. This information can make a huge difference in getting what you are looking for.

You are going to want to make sure that you have iTunes open on the computer with Windows to be able to communicate with the iPad so that you can get it restored. You may also have to put your iPad in restore mode. You can see how to do that here If you can’t update or restore your iPad - Apple Support