I'm a relative beginner when it comes to Emirates upgrades and Expertflyer. Perhaps someone can help me out.

I am flying DXB-MEL next month on EK408. It's a flex Y ticket and when I checked a few days ago the EK website showed availability. I wanted to do the upgrade there and then, but was waiting for some miles to be credited from a flight 5 days prior (what's wrong with Emirates?). When the miles finally came through, after a complaint to Skywards, guess what. Your guess was correct, the availability had disappeared.

When I look at Expertflyer it shows D0 and I7. What does this mean as far as my desired upgrade is concerned? And is it true that people booking from Australia (like me) are less likely to see upgrade availability than someone booking from the USA or elsewhere?