Could not find a topic here that is helpful to my particular situation, so here goes: My brand new late 2011 17" MBP will not recognize my 480GB OWC Mercury Extreme 6G SSD. My Boot ROM firmware is listed as MBP81.0047.B26, which ostensibly is a newer version than specified in the EFI 2.3 update -- which supposedly contained the fix to let this machine support 6G SSDs. Well, as I said, the MBP will not recognize the drive - installed internally, I get the flashing question mark folder at startup. The machine WILL see the drive when connected via a USB enclosure, and I was able to install Lion on it that way. A call to Apple tech support, which was escalated to senior engineers, was useless. They couldn't tell me if there were any differences in the firmware between 24 and 26 that might affect the SATA III support. The tech recommended I come to the discussion boards for a solution!! I do know that I cannot self-install the EFI 2.3 updater - the installer says my machine will not support it. So, what do I do? Supposedly this machine should support the 6G SSD in the main bay, but no luck as of yet. I'm miffed at OWC for not telling me during pre-sales calls that there could be issues with their drive in this machine, but I can't get in touch with them right now as they're closed for the holidays.