How can I down grade from OS 10.6.8 to 10.6.4?

I want to reset the DVD Drive to RPC-1 by flashing the Firmware.  The program will only work on OS 10.6.4 or earlier.  I have 10.6.8.  13" macbook pro.
thanks,
don

vytran wrote:
Uhm i have a macbook air and i updated to 10.6.8 after that i want to renew my macbook so i install the computer with the DVD 10.6.4 OS and the computer said that the DVD cannot be install to this computer. WHAT should i do?? how do i downgrade from 10.6.8 to 10.6.4?
You need the origianl method (or a new copy of it) and then hold the option key down to boot from it.
Then erase the drive in disk utility first,, then install 10.6.earler on it, the don't Software update as it will download the 10.6.8 Combo Update.
Naturally erasing the drive will remove all programs and files, but that's the only way to downgrade OS X to a earlier version.

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