To reset the open firmware password you can either reboot while resetting PRAM 3 or more times or just pull out the RAM, reboot and reseat it after the next restart. Have fun with that.
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opfw
You can use the command line tool opfw to set open firmware passwords. It is available for download over at MacEnterprise.org. You can also use opfw to mass deploy open firmware passwords, which is basically what NetRestore does when you use their setting for this.
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Mac OS X: Using OPFW
To set a password with OPFW: sudo OFPW -pass mypassword To set firmware mode to command mode: sudo /usr/local/bin/OFPW -mode 1