I have a 250gb SSD which needs updating to the latest fw, it's slowing down so this needs doing and a fw fix is available. I have downloaded the iso image from Samsung and bunt a disk image but cannot seem to mount this from a restart. Unfortunately I have an apple wireless keyboard. I did an SMC controller reset and manage on one occasion to restart using the alt key but it only showed the SSD and the recovery drive, no CD drive. I also tried booting from the CD but the mac just restarts as normal.Running 10.11.5 on a cMP 4.1 2009 (firmware update to show as 5.1). Any suggestions or advice appreciated.