Factory reset the ipad but app store still logged into another account

Check my story:

Do I need to repurchase apps if I moved countries?

In short - you can't. You have to stick to your old account for updates of the software you bought and create a new AppleID for purchases in new country.

Unless of course you are willing to pay for all applications (and in-app purchases) again. Then there's no need to have another AppleID, you just switch store country, but there's no automation for re-buying them unfortunately.

Amazingly, that last edit made me search and find answer explained here and on other places: http://forums.macrumors.com/showthread.php?t=1447069&page=4

Not only changing the date, but first signing out of iTunes from Settings, then change date to manual to something in the future (2014 in my case), try to access App Store through the app again, it fails, then change back the date to automatic, log in to App Store. And voila, now it works.

Edit - However, the address page started working mainly because the browser turned from my native Swedish into English. In the English version it works, in Swedish it doesn't.