I just got a Gateway today and ran an OTA update on emunand only to discover a non-working 9.2.0-20U. Damn - is there another way to update to 9.0.0?
I'm affraid not, I guess you could format your emunand again, it would be 4.5 but your gateway menu should work.
all the r4 cards works well. it's a little upgrade,took a few seconds to finish.