How can I boot my MacBook Pro from a DVD to update my SSD firmware I have a MacBook Pro 2.3 GHz Intel Core i7 (mid-2011 model) running OS X 10.8.2.  I upgraded to an SSD which I bought from Crucial and works just great.  Crucial sent an email recommending I upgrade my firmware to get even better performance from my SSD. 

I downloaded the firmware to my desktop in the form of an ISO file from the Crucial website, and the instructions told me to burn this to a disk and change my boot order in order to boot from this disk.  I burned the disk but subsequently have not been able to get a bios screen or to be able to boot from the DVD I created.  I have tried holding down the C key but nothing seems to happen.  

What do I need to do to complete the installation of the firmware?
You should know there is no such this as "BIOS" on a Mac (the equivalent system is called EFI, but you don't boot into it to change settings). To boot from a DVD or any other external medium, you'll have to hold down the Option ⌥ key while booting.
Then you'll get a list with all the bootable devices and there you can select the device you want to boot from. 

Or you can go to System Preferences > Startup Disk to select your disk and then reboot. Then you'll also boot from the disk.