i2004 phase 1 to phase 2 upgrade

Not sure what you mean by doable? If you mean can you buy a phase 2 and use it to replace your phase 1, the answer would be yes. If you mean do some kind of firmware upgrade, I think the answer would be no.

If the phase 2 i2004s are anything like the phase2 i2002s, it's a step backwards in terms of hardware quality.

Phase 2 sets have more intelligence and local flash storage in them, as well as 802.3af PoE support, so I would agree that there is no simple firmware upgrade.

That makes me wonder. Do the Phase 2 i2004s have a better designed base/angle adjustment that doesn't suck?