How can I downgrade from 10.5.1 to 10.5?

Well after an frustrating call at Apple support, they told me that the 10.5.1 Version is the Subject of my problems (My iMac doesn´t recognize my MiniDV Cam). There a driver missing, that was there in 10.5!!
So I want to try out and downgrade from 10.5.1 to 10.5. Is it possible? How?

I find it hard to believe the camera that is recognized by 10.5.0 is not by 10.5.1. I suspect what has happened is either the driver got corrupted or the PRAM or Firewire bus needs resetting. The latter two are described below:
http://docs.info.apple.com/article.html?artnum=2238
http://docs.info.apple.com/article.html?artnum=88338
Downgrading or analyzing corrupt files is only possible if you backup your data first*:
http://www.macmaps.com/backup.html
First backup, and then tell me when you are ready for the latter.
- * Links to my pages may give me compensation.

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