V26 Nav OS update completed!
The Blank Screen is about 5-10 seconds is longer than before

, but nevertheless, the proper "upgrading screen" appeared.
The lowest speed Alcohol would allow me with either of my drives was 4X and it worked fine.
BTW, I like how the freeways/highways are labeled I10 and CA60, instead of 10 and 60, etc.
Graphics are much better and smoother....
I will upgrade our fellow local BMW buddies NAV system tomorrow.