Apple ID and password
how can I change a Apple ID and password on an old iPad? Mother does not remember any of her information
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Activation Lock is intended as a theft deterrent, and is intentionally not easy to bypass.
You need either the Apple ID and password, or the original purchase receipt.
Here is how to recover the Apple ID:
If you forgot your Apple ID password - Apple Support
If you forgot your Apple ID - Apple Support
How to use account recovery when you can’t reset your Apple ID password - Apple Support
Contact Apple for help with Apple ID account security - Apple Support
Or you need the original purchase receipt showing the serial number, and a discussion directly with Apple.