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reversing smc update, need to modify smc version


e. blofeld
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hi there,

 

i hope this is the right forum.

 

i would like to reverse the smc - update i did on my macbook to version 1.4f10

i have the original installer for this version, but the installer does not accept to upgrade since i have 1.4f12 installed.

 

now i'd like to modify the nvram or efi or whatever to make the installer work.

 

is this poassible ?

 

thanks

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Don't think this is possible.

 

The firmware restore CD which you can download from Support/Downloads, has this description:

http://www.apple.com/support/downloads/fir...rationcd12.html

 

The key parts are:

 

You can only use this to restore the firmware after an interrupted or failed update. If your computer is already in this state, you’ll need to download the software and create the CD on another Macintosh computer, or you can take your computer to an Apple Store or Apple Authorized Service Provider to restore your firmware. This CD can be created on both PowerPC- and Intel-based Macintosh computers.

 

Note: This CD cannot be used to return an Intel-based Macintosh computer’s firmware to a previous version if a successful update has already been performed.

 

So only if your machine has a failed firmware update, can you use this restore CD.

 

I know that doesn't help, but it is pretty risky trying to get a failed firmware update.

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