Hi NiLuJe! I'm in the UK and I got my shiny new PaperWhite 2 WiFi + 3G on 5.4.3.2 yesterday.
Whatever I try, 'Update Your Kindle' is greyed out, and I believe I know the cause but not the solution. My serial number prefix is '9060', which did not appear on
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers until I added it earlier into the European category (not sure if that was the correct place, but pretty sure the UK is in Europe...).
One other interesting point is that both my laptop and the Kindle itself report that it has 3.4GB of free storage, which smells to me like a 4GB model. I thought these were only in Japan, but cool huh? Was I maybe sent a Japanese model for some unknown reason? Is 9060 maybe the Japanese 90xx serial prefix?
I have no idea, and I'm kinda hoping that maybe you have some answers.
Will.