I can't update my kindle to 6.3.. Help.. The update your kindle button it Grey.
Put it on charger if not fully charged and do a restart. It might restart itself as it hits lock screen. It might have downloaded the update in background. Mine did just as I was pushing file from my laptop. I had to go in and delete file after update processed. Wish they would use notifications to let us know if it's downloading update in background.
Best enhancement: the brightness control actually works now. Previously the screen would dim down to about 50% on the slider but no more resulting in a screen that's way too bright in a dimly lit or dark room. The slider now is effective through all its travel AND the screen's lowest brightness setting is much more appropriate for viewing in the dark.