Unfortunately, I didn't read this forum before purchasing my Lifeline. I have a MacAir. This computer doesn't have a disc drive on it. I also don't have access to a PC computer (even my work environment is all Mac). So, how do I get the firmware upgrade onto my Lifeline? I can't even register my unit because when plugging it in, a window comes up saying I need to upgrade the firmware from a pc, then locks up the site. I have to do a force quit to get my screen to clear.