I recently upgraded from a MacBook (13-inch, Aluminum, Late 2008 - MacBook5,1) to a new MacBook Pro (13-inch, 2.4GHz i5, Late 2011 - MacBookPro8,1). The MacBook was running Lion, 10.7.3. Having upgraded the MacBook's HD to a 750GB 7200rpm drive, I wanted to use this larger HD in my new MacBook Pro from the start. After purchasing the new machine, I opened up both and did a hard drive swap. The 750GB drive went into the new MacBook Pro and the new 500GB drive went into the MacBook. Everything went well. Both computers booted up. The MacBook started Lion setup as expected and the MacBook Pro loaded Lion and all was how I left it on my MacBook before the swap. As I began to work on the MacBook Pro I noticed it did not have the newest EFI Firmware (Macbook Pro EFI Firmware Update 2.3). I knew this because while booting off of another drive, Lion Internet Recovery was not a boot option. I ran software update and no updates were available. I downloaded the EFI Fireware update form apple.com (http://support.apple.com/kb/DL1450) and when I attempted to install it I received the message "This software is not supported on your system". This raised concerns that maybe the hard drive swap was not the best idea. Does my MacBook Pro somehow, somewhere think it is a MacBook? A screenshot of the MacBook Pro's System Report can be found here - http://db.tt/mBl70IY7 It reads that the computers current Boot ROM version is MBP81.0047.B26 while the support document (http://support.apple.com/kb/DL1450) reads that after updating the Boot ROM version should be MBP81.0047.B24. Any advise is appreciated. Thank you!