I just picked up a back-up HD-A1 this evening. It is in mint condition with Firmware 2.0. My other A1 has firmware 4.0. I remember reading many posts about how the updates made the boot-up times of these players faster. Well, I decided to have a little race. I set them up side-by-side and hit the power button on the remote. They both turned on at the same time. Both the 4.0 and 2.0 machine booted up to the "No Disc" message in exactly the same time. I hit the power button again to shut them off and they both turned off at exactly the same time.