Need to know how to flash this into my t999

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http://forum.xda-developers.com – this rom looks cool but its for the att s3, I have seen several post saying that we can flash their roms and vice versa but i have also seen post that says that it cannot. so I want an opinion from an expert. can we flash this rom to our t999 with no problems? back on the s2 we could flash from the skyrocket and to make it stable we needed to flash a tmobile kernel with auto rotation fix and a call echo fix. and that it. http://forum.xda-developers.com/show....php?t=2053699 (HowTos)