Lot of questions and I hope I am following your train of thought.
If your treo is at&t use the desktop and upgrades for that carrier. If and when you unlock the phone you may need to use different upgrades. But I think you want to use AT&T and have the phone unlocked, right? I believe if and when you unlock the treo the treo loses your info. So make sure you have a backup or have a good sync.
Yes you should do a hard reset before syncing (first time)or entering any info on the phone. At the palm site make sure that your palmdesktop is the right one for the phone.
I would wait on the firmware upgrade and even the unlocking for awhile to verify your phone works and is stable in case you need to return it (ifyou can)
For your version I believe at the phone screen, hit menu, options, phone info and your version should be listed.
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Plunker
Just trying to learn and talk at the same time here.
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