Hi Samsungshah,
There is a great post here
http://androidforums.com/samsung-i7500/36913-latest-firmware.html?highlight=baseband+codes to read which should help you a lot. I do not know which country your nation code "DD" stands for perhaps someone with the same could help you more. For an example in France I need to enter these codes into the FUS Downloader CSC Version: I7500BOGIG8
PDA Version: I7500XXIG8
Phone Version: I7500XXIG8
Suffix: BOG
Nation Code: XX
Model: GT-i7500
Or you could just download one of the latest firmwares IK4 ,IK5 and flash the phone using Odin if you are not bothered by not having your local CSC on the phone (If you are from Canada or Brazil please do not flash your phone ! ) Hope this helps a bit
