for those that wanna get back to dk28 with RFS from ext4 for reasons of your choice this is best way imo, no odin needed and your done. i have used it and it works coming from midnight rom to RFS froyo.
just gonna post xda link, you have issues you can post them there.
[Stock Flash][CWM]ReRFS.Format.ROM.DK28 to revert back to RFS from ext4 - xda-developers