Hi i just installed the 480gb ssd in mid 2012 macbook pro 15" one week ago,   everything is perfect very happy with drive, i want to update firmware to 211, my problem is i have no dvd drive,  it says to burn to dvd first,  is there any other way to do this,  could i use sd memory card?    thanks in advance.

you can do it from USB drive as long as your MAC supports USB boot. You will need a third party app like power ISO (not sure if that is available for MAC) to put the ISO image on the USB and make it bootable.