Help! I don't know which file to pick! The filenames confuse me!
First thing: don't panic! It's all rather easy, and you won't easily do something bad! I am personally attentive to use the exact same version as the ROM I am running, but it's not that important.
First, go to Settings -> About phone -> Build number. It should say something like FROYO.xxJPy. It's primarily the JPy that we are interested in. Try to match that with a download link available in this (and the next few) posts. Some of the downloads dont just have JPy file name format, but are called xx_xxx_JPy.
Let me explain that. Samsung isn't always very precise in naming/marking their different (leaked) firmwares. CF-Root's are modified kernels, the filenames explain in more detail which exact firmware ROM the base kernel was taken from, for those experts who understand.
If you are not one of those people, go back to the JPy thing. The "y" in JPy is 0-9, A-Z. If they run out of numbers, they use letters. So A would be 10 (9 + 1), while Z would be 35 (9 + 26). Find the one that is closest to yours, if yours is not present, and flash that one.
The truth is, these kernels, they don't differ all that much. It's quite likely that the very latest version (at time of writing: JPY) will work perfectly fine on your ROM. There are some small differences, but using a different version is unlikely to cause serious issues. The closer the versions are, the less likely there are to be issues, BUT it is still quite possible that the latest version will work better for you than the matching version (or not!).
