Putting a custom rom on X10a ?

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http://forum.xda-developers.com – I just got this phone from my sister, but last year I rooted it. I think it was the superoneclick thing? Any way Its still on att rom and firmware version is 2.1update1. build number 2.1.A.0.492. and I want to know if I can put a custom rom n it and if so how? Thanks in advance (HowTos)