Lost Firmware Password - How to reset Firmware in G4 PowerBook

Hi there,
My OS is 10.5.4 but this might be a little off-topic and if so, my sincere apologies.
Several weeks ago, somewhat stupidly, I created a firmware password for my G4 17" PowerBook using a third-party utility but have lost the paper upon which I wrote the password down. The paper is not where I thought I had put it.
Yesterday, completely forgetting that I had a firmware password in place, I had to reformat my HDD and have now discovered that I am unable to boot the PB due to the lack of the firmware password.
My questions are:
1. Does anyone know of a method to reset the firmware to its default state?
2. If not, is the firmware located on the logic board, in which case I can replace the logic board?
3. If not, is the firmware module replaceable or do I have to replace a complete motherboard.
4. Any other possible solutions to this problem?
Many thanks for your help.

Hi V.K.
Many thanks for your feedback. However, I have tried both the OS 10 install disk and the original disk that came with the PB but still get the request for the firmware password on startup. Regretfully, no luck there.
Anyone have any other ideas that might help? All suggestions will be gratefully received and tested.
Cheers
Roger

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