Multimedia keys don't work after downgrading lion

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Hi guys,

I'm quite new to Mac. After got my MBP from my company, I had to downgrade from lion to snowleopard because of the stupid issue of my project. Unfortunately after downgrading, all the media keys (F1-F12) don't work. Especially I want the F1/F2 (brightness up/down), F10/F11/F12 (volume mute/down/up). How can I make these keys work again? Do I need to install some driver or update the firmware?

Thanks
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
It would also help if you provided us with some specs on the MBP. Year, and model. Specifically if it's a 2011 MBP that was preinstalled with Lion, it can not be successfully downgraded. And yes, as chas asked, what disk did you use?
 

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