How do  you reset the root password in Mountain Lion?

After install of Mountain Lion on my old iMac, I could not enter administrator, no password would work, Apple support helped me go through terminal to reset root password and root as administrator . I then was able to reset myself as administrator with a new pasword. I used that paassword a few times now it wont accept it again. I dont remember all the steps to reset the root password and recover from this situation.. Can anyone help?  Is this a bug in Mountain Lion?

I'm having similar issues but other concerns
1. Can't go into recovery mode since its protected by firmware password, which I don't have. All option keys sequences go into the same firmware padlock, which I don't have the apparent pin.
2. In terminal mode it didn't happen to recognize that unix command.  Also since I'm just on guest would that reset for the admin or possibly the guest acct?
3. I've done the DIMM pulls and even though older model, 2011, it didn't appear to a reset for the firmware password.
Any other options??

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