Root How do I get from2.3.4 UCKH3 to UCKK4?

[kilbert]

The install guide assumes the Samsung Captivate already has Android 2.3 build UCKK4 (AT&T)

from : http://wiki.cyanogenmod.org/w/Captivatemtd_Info

I am ready to install cm10. unfortunately, my kernel is wrong (uckh3). How do I correct that (to uckk4)so I can follow the guide?

thanks