Another of our SP2 units had installed the Update 1 just fine. But right afterward it had gotten stuck always booting to the UEFI screen (the one that offers to install or delete Security Keys).
I finally managed to get out of it by pressing Power + Vol Up for at least 15 secs. The problem hasn't reappeared since then...
P.S. I seem to recall that immediately before this happened, I had noticed an air bubble on that unit's rear skin, and I had pressed down hard on it and squeeze the unit hard with my hand. Hope the pressure didn't cause some kind of hardware glitch?
I finally managed to get out of it by pressing Power + Vol Up for at least 15 secs. The problem hasn't reappeared since then...
P.S. I seem to recall that immediately before this happened, I had noticed an air bubble on that unit's rear skin, and I had pressed down hard on it and squeeze the unit hard with my hand. Hope the pressure didn't cause some kind of hardware glitch?