How to disable the open firmware password on a G4 iBook

I recently replaced the HD in the old G4 iBook (now I see why people were excited about the new macbook designs… this vs this). Partitioned and formatted the hdd prior to installing. Thought I’d use the old “hold down T during boot to turn the laptop into a firewire drive” trick….

unfortunately this page http://support.apple.com/kb/HT1661 has the note

Important: The computer will not go into FireWire target disk mode if “Open Firmware Password” has been enabled.

So here is how to disable the open firmware password on an ibook. (After the print env command check to see if the security-mode option is command or full.)

reboot
hold down cmd-opt-o-f
printenvsetenv security-mode none
reset-all

reboot
hold down T

copy files

reboot
hold down cmd-opt-o-f
setenv security-mode command/full what ever it was before
reset-all

get on with your life 😉

Useful links:
http://manuals.info.apple.com/en_US/Command_Line_Admin_v10.5.pdf pg134
http://www.firmworks.com/QuickRef.html
http://www.ifixit.com

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