How can i install 8 gb ram on a mac mini early 2009 when it says i dont need the EFI firmware 2.1?i can only install 4 gb but the side of OWC says i can install 8 gb? what to do?

i have a mac mini early 2009 and i want to install 8 gb ram but it doesn,t work.
it says on the OWC site that i have to install the EFI firmware 2.1 update but it won,t let me,it says(the mac mini)that i don,t need this update.
my kernel is 32bit but my EFI is 64 bit,how can i install 64 bit so i can use the 8GB cause with 32 bit i can,t use more than 4gb ram

Check your computer's EFI Boot ROM version;
1. From the Apple () menu, choose About This Mac
2. Click More Info Under Contents
3. Select Hardware
If your Mac mini's Boot ROM version is the following or more recent, then you do not need the update to use 8 GB of RAM;
Boot ROM Version: MM31.0081.B06

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