Activation lock

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be turned off:

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, or unless you can secure the cooperation of the previous owner, you’ll not be able to defeat or bypass the Activation Lock. Without documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple won’t assist - and nobody here will be able to help you.

If you are the owner of the AppleID that previously activated the device - and you have forgotten your AppleID or associated password, these 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

Unless you AppleID account has not been fully/correctly configured, or has been seriously neglected, recovery of the AppleID and password should not be difficult.

More information about recovery of your AppleID:

If you forgot your Apple ID - Apple Support

More information about recovery of your AppleID password:

If you forgot your Apple ID password - Apple Support

When you recover access to your credentials, you would be well advised to log-in to your AppleID account from a web browser - and verify/update any email addresses and trusted telephone numbers:

https://appleid.apple.com

rgibboz Said:

"Activation lock I've recently got my ipad back from the police that as it was seized. I brought it off a friend not knowing it had an activation lock on it. Could you please help me unlock it thanking you"

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Go Here: If you Forgot the Passcode on your iPad, or your iPad is Disabled - Apple Support

Logging Back In Successfully:

Do you have the original receipt of purchase? If so, take it to your local Apple Store, along with a Photo ID. See if the staff at the store can reactivate it for you. Elsewise, it may be useless to you. :(

Activation Lock is an anti-theft mechanism, and it wouldn’t be much of a deterrent if it were easy to bypass.

You wouldn’t be here if your friend could clear that lock.

Nobody here can clear that.

And Apple won’t.

Move on.

Recycle it.

The All Too Common SAD Reality of Buying a used iPad/iPhone - Apple Community

You're friend is going to have to remove it from their Apple ID. That is the ONLY way that you're going to get it out of Activation Lock. Activation lock is there to prevent theft and wouldn't work if it was easy to get past.