I am curious what exactly takes place when the MS Pro firmware update is applied to a handful of Vaio notebooks.  Does this actually flash a chip on the memorystick reader board?  I ask because I have a vaio SRX77, which cannot be updated for memory stick pro.  However, I recently replaced the palm rest, including the stick reader board with parts from an SRX87, which can be updated.  If so, I would imagine it would be possible to hack the firmware updater to function on my SRX77.  Can anybody offer any insight on this possibility?

For the record, I was able to install the update sucessfully on my SRX77 with a card reader board from an SRX87.  With the board and firmware update, I can read MemoryStick Pro media on my SRX77.  This can be accomplished either by ‘modifying’ the installer avaliable at   here or running the installer on a compatible laptop and copying the firmware update program files that are extracted when SO-P00000C03CL.EXE is run.