How do I upgrade my disgo9200 to kitkat

Android 4.4 is available on some devices out of the box. You can tell by looking at the notifications bar at the top of the screen. If you're on 4.4 then all the icons should be white. Earlier versions appear blue.
If you want to double check, head to the settings app on your phone and look for About Phone under System. Scroll down a little and you'll find the Android Version bar which lists the version currently running.

Despite being released last year, only a handful of Android handsets currently use Android 4.4, though the list is ever-growing. First, you'll need to check online to see if your device has the update. You can either do this online or on your gizmo. For the latter, head to the Settings app and find About Phone under System. From here press System Updates. Your phone will do a little searching and either find the update or tell you the software is up to date.
A huge array of handsets from major manufacturers including (but not limited to) Sony, Samsung, Google, HTC and LG already support the upgrade to Android 4.4, with more being added by the month.
3. Check the update is ready on your phone
Even if the update has been released for your make of phone/tablet, it may not have come to your individual device just yet. Usually the phone itself will notify you when the update becomes available via the notification bar at the top.
Again, you can check yourself by heading to Settings, finding About Phone and pressing System Update.
4. Time to download
If your phone is compatible, downloading the update is very, very simple. Either find the notification about the update and tap it or head to Settings, scroll down to find About Phone, press it and find System Update. Follow on the onscreen instructions and your phone will reboot itself with sparkly new.