I have some asian HTC Hero on AT&T as well. I asked a similar question about updating to the US generic 2.1 ROM when it comes out, someone told me that I can only download the asian update when it comes out, unless i root my phone. I tried using my serial number to see if i can download the US version of 2.73 update from the HTC site, and it said its not suitable for my device (mine shipped with 2.73 already). So I guess we are stuck with whatever region we got our phone from to get our update.
Im not sure about your other questions. sorry.
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