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Officially the "max update" is Android Gingerbread. Developers are working a custom ROM with Android 4.0!
Watch this video tutorial cnet.com/videos/how-to-install-a-custom-android-rom/ to see how you can install a custom ROM in Android.
Assuming your phone has been rooted and a custom recovery app is installed, you can flash any kind of custom ROM. Some users will install different custom ROM's until they find one that they like. Others will install "nightlies" which are beta versions of a ROM that's not fully stable yet, but are updated daily.
As the Samsung Galaxy S2 has reached its service life, which typically for most smartphones is 2 years, it is not expected to receive a OS update from Samsung or the carrier (AT&T in this case). However, there are a number of custom ROM's that are KitKat to choose from.
A custom ROM is modified software, typically of an operating system that you would overwrite or erase over the phone's stock system. The customized ROM may have features that may be different or better than was was on stock.
As a rule of thumb, it's a good idea to wipe or reset your phone prior to flashing a custom ROM. It's also a good idea to save all your files and data to your phone's external SD or to your desktop as well before the wipe. After you do that, then flash that custom ROM. If you choose to flash the custom ROM without doing a wipe (called "dirty flash"), you might encounter bugs in your everyday usage.
The Kurio 10s will generally be able to be flashed with a custom Android ROM but one should consult the workers and employees of the store before proceeding.
The Samsung Behold II had an older version of Android OS on board (Android 1.6 OS) and had Samsung's TouchWiz interface, which it had mixed reviews on its usability. To run similar to the Nexus One, you would need to unlock and root the Behold II, and then flash a custom ROM that equals the Nexus One's Android 2.3.6 OS.
At the link below.
you need a rooted phone and a custom rom
It is a custom rom where you can catch pokemon from gen 1 to gen 3 in one game.
use this code *2767*3855#, this is a full rom reset.