I actually didn't update the kernel on my EZ4-Lite when I first got it, but have since updated it when I changed skins. To get roms to work, you must copy them to the microSD using the EZ4 Client. I downloaded it from the sosuke english EZ4 forums.
You can't just copy the roms directly with windows explorer, since the EZ4 Client handles patching routines for you.
So the only patching you need to do is automatic, through the EZ4 Client, and not anything else.