Folks over at OWC have discovered that a ‘secret’ firmware update has enabled access to 8GB of RAM on late ’08 MacBooks. In late 2009, an EFI Firmware Update was released to address the buzzing noises coming from the optical drive. However, it seems that somewhere along the line, Apple changed this update without notating it anywhere. Whether any other elements were affected by this change is undetermined, but it did change memory addressing; with the later version of the update installed, you could address a full 8GB in Snow Leopard. Unfortunately, Software Update doesn’t show this version as being different from the previous one, so users wouldn’t be notified if they had already updated their firmware to the older version. This discovery applies to the following MacBook models: MacBook 13.3? 2.0GHz and 2.4GHz MacBook Pro 15? 2.4GHz (All) MacBook Pro 15? 2.53GHz model w/ExpressCard Slot (Late 2008) MacBook Pro 15? 2.8GHz model w/ExpressCard Slot (Late 2008) Next, check the Boot ROM Version in your System Profiler. MacBook Pros with a Model ID of MacBookPro5,1 should have a Boot ROM Version of MBP51.007E.B05. MacBooks with a Model ID of MacBook5,1 should have  a Boot ROM version of MB51.007D.B03 Machines with other Model IDs are not affected and don’t need an update. If your BootROM doesn’t make the numbers above, download and install the “secretly” updated firmware from here:’ Finally, make sure you are on Snow Leopard 10.6.6 then upgrade your RAM to 8GB. Let us know how that works out for you in the comments section below. Stay tuned for more news and info by following us on Twitter and/or by subscribing to our RSS Feed. [Source: OWC (Blog)] Authors:

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