The firmware comes as a dedicated .iso file containing the specific update file which you can run on your Mac. It needs to be burned to a CD with Disk Utility and then becomes a bootable Linux OS which then auto-runs the Crucial updater program. It will find your SSD and then update the firmware (nondestructively to your data contained on the SSD).
Thanks. Doesn't sound too hard. I got my M4 installed and its currently running the Rev. 309. I suppose if I run into issues I may update it but so far no issues.
And finally, I'm getting 3 gb/s! It's not out of this world numbers like you guys on Sata III but this will do. Way better than what I was getting last week!
I think I may purchase another M4 and plug it into the ODD and run a Raid 0 setup.