That only Cisco TAC can provide and only for legitimate troubleshooting purposes or to apply the workaround of a bug.
Look at htluo's blog, there was a non-supported method of creating a root account. It clearly mentions that the procedure should only be performed on non-production servers so if all you want is to play around with the lab server you can do it.
HTH
java
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HTH
java
if this helps, please rate