Installing iMac G3 Firmware Update 1.2 on Mac OS X

Good evening!
I own an iMac G3 Rev. D (333 MHz). It's currently running Mac OS X 10.3.9. At first, I tried to downgrade to Mac OS 9, with no success. Eventually, I found out that the iMac wouldn't react to any startup keyboard commands (just like C, Option, PRAM reset and so on). Probably, the pre-owner password protected the Open Firmware.
I downloaded the Open Firmware Password Utility, but after installing it told me my firmware wasn't the latest version. I tried to install Firmware 1.2, but alas! this, in turn, is only possible under Mac OS Classic.
However, as long as I can't boot from CD, I can't install OS 9. It wouldn't even run the Classic mode.
Is there any possibilty to upgrade to Firmware 1.2 under Mac OS X Panther?
Thank-you very much in advance!

If you are running Panther, you already have that firmware update.  No iMac PowerPC can run 10.2 or later without the most current firmware on their system.

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