How to downgrade my firmware version after a "succesful" update?

Dear Macusers,
Is there any way to downgrade my firmware version from 1.5.1 to a lower version? Even if my firmware update has been applied succesfully? I cannot use just the firmware restore CD because that is for an interupted or failed update.
Greetings,
Tim

Hello,
Many thanks for your reply. Yesterday I posted a topic about this problem with some more details. I hope this may help.
+"Since today my trackpad and keyboard doesn't response anymore. This problem started after I exit from sleep mode. Then I get a security form where I can enter my password, but I couldn't. So I restarted my macbook pro for about 5 times, removed my adapter and battery, but it doesn't work.+
+After that I went to iFactory and they said it is apparently because of my latest firmware update 1.5.1. But why does this happen a week after I installed this update? Anyway, he suggested me to downgrade my firmware version with a firmware restore CD. Well it sounded as an straightforward and easy solution until I read that the restoration CD doesn't work when the firmware update already has been applied correctly.+
+I have read some other topics about keyboard issues and some points are relevant for me:+
+I'm be able to use an external USB mouse and keyboard.+
+At system profile by USB, only my iSight, Bleutooth USB host controller and external USB devices are displayed.+
+The keyboard background light works properly+
+This problem happens all of a sudden without intervals or strange behavior.+
+Using Leopard (10.5.2) and Windows XP via bootcamp+
+I hope I can solve this problem really quick because I need my Macbook Pro badly for my study. Thanks in advance for studying my problem.+
Greetings,
Tim

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