W580 Flash Clarification

[lemniaalsa]

I've been looking around the forums and I just wanted to make sure I have the right idea. My w580 is from AT&T/Cingular.


So I need to flash the firmware and the file system according to this:
Tutorial | Flashing/GDFS-operations/Uploading files with XS++ - SE-NSE Forums




So, I'll use XS++ with:

Firmware: W580_R8BA024_MAIN_GENERIC_LA_RED52
File System: W580_R8BA024_FS_AMERICA_2_RED52

I've read on the forums something about customs pack, specifically the Laura_i. Do I need that or should I skip it. If I do need it, where can I get it and how do I flash it? I've tried using search but I keep getting 0 results :[

And finally, will I still be able to use the Sony D2P , update service and all of the other programs with my newly unbranded phone?

Thanks~