1st generation ipad disabled, forgot password

We have locked the ipad because we forgot the passcode. I have tried several times to "restore" from iTunes. No luck. I am getting error messages on iTunes.......... Is there a link I can get the proper file to upload to the ipad to "restore"? I understand the files may not be there, but that is risk we take. Thank you!!

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If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

The restoration of a first generation iPad may be hampered by the fact that this iPad cannot run any iOS version past iOS 5.1.1, which is now quite old.

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