How to I set up an used ipad with my credentials if Apple doe not accept password or passcode?
How to set up a used ipad with my credentials if Apple does not accept my password or code?
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Check this link to set up new Passcode. The process will erase the device.
If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support
I'm afraid you may also encounter Activation Lock which is a theft prevention feature. This Lock requires the Apple ID and Password of the original user who set up the device. Without this information, you will never be able to use the device. In which case, it can be recycled at any Apple Store if you can't get your money back.
How to remove Activation Lock - Apple Support
The All Too Common SAD Reality of Buying … - Apple Community