Is it possible to install the unofficial Froyo on a Samsung I5800XXJG3 android phone? I know the official Froyo has not been released, but I see here that you can Install it on samsung phones: http://androidforums.com/samsung-galaxy-lite/251507-update-android-2-1-eclair-2-2-froyo-your-samsung-gt-i5800.html
But there it mentions 

I5800XXJPF
I5800XXJPB

but does not mention
I5800XXJP3

so is it possible, if so, how?
I can confirm that It is possible with the I5800XXJPF update with the 4 (out of 5) separate files and the Odin multi downloader tool. 

here are the instructions of how to update 2.1 Eclair to 2.2 Froyo.