OK I see. Yes down grading BIOS is obviously something that can be done. While annoying is required sometimes. However I would think a warning saying you are going backwards should have be built in.
There seems to be a lot that is rushed together about the Z1. Last night I had the battery plugged in and noticed it keeps ticking when not in use. You need to listen carefully but there is a distinct tick which I dare say drains the battery. I have no idea what this ticking is, and can only think it's poor programming that does not shut down the machine fully. I cant believe it does not have a physical switch that powers it off. knowing it's being specifically used for people who travel this is a major oversight and gives an indication as to the level of care and commitment the company seems to be investing in this product.
The excess tube wind noise seems to be due to inadequate venting and I would think a very small and cheap fan. Again if you listen you can hear the fan noise change as you tip the machine, indicating a non balanced and cheaply designed device. Increasing the size of the fan would give more surface area allowing the fan to spin at lower rpm. I would think this would cause less noise as well.
Might even help with the ear popping experience I and others get on this device. I found I need to lower the pressure by at least 2 settings so my ears don't pop consistently each time I yawn or open my mouth. I can only feel for the people who need a higher setting, it must be very annoying. I am lucky as I can get through the night with 4/6 down from 6/9 on my F&P.