How do I revert firmware PowerPC g5 to older firmware?

Hi, I have a PowerPC G5 dual 2.0 june 05 that I would like to roll back the firmware. I downloaded the version from apple and when I try to instal it says I have a newer version. Without looking the last numbers were f8 instaled and f7 downloaded.
My fans run crazy. The drive bay fans and the rear cpu fans. No hardware problems running hardware test. Nvram reset, pmu reset. Memory all good,
I have a seagate green 2tb drive.
I got this machine and another and this was having some troubles and never really worked perfect. First issues were hanging at the apple logo. After much monkeying I was going to use other machine and swapped power supplies. No difference, but noticed that the bottom processor was not seated exactly perfect.
This would explain the intermittent booting. I had it at the apple store and it fired perfect every time, got it home and nothing.
At that point with 80 gig sata the fans and all worked perfect. Since 2tb installed the fans keep humming away. I would change back to the 80 gig, with the exception that it seems anytime I change any hardware the boot hang happens.
This just has me suspect to the firmware issue, and want to roll it back before any more swapping. It is consistent in booting now, and just noisy.
I have searched internet and cannot find a step by step to revert back. Years ago I did a manual update on an imac, seemed I went into terminal and typed a long string etc.
Any ideas or help appreciated.
Thanks

Before you go that far, have you reset the NVRAM? Occasionally a HW change will confuse the device table stored therein and a reset will clear things up.
To reset NVRAM, you need to boot into Open Firmware by holding down the cmd-option-O-F key combination until you get the white Open Firmware terminal screen. Once you are there, enter the following three commands:
reset-nvram <cr>
set-defaults <cr>
reset-all <cr>
The last command will cause the machine to reboot and with any luck, you should come up with a normal boot.
The fan issue may involve a thermal calibration issue, though the fact that it works fine with the 80 Gig drive says that's probably not the issue.

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How do I revert firmware PowerPC g5 to older firmware?

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