flycast Q

I was looking into downloading Flycast for streaming music, but it says it works on OS 4.3 for the curve and that at&t works on that. I'm still on 4.2.2 with at&t and thought that was the highest. Can I dl OS 4.3 for at&t and I'm just not aware or will flycast work still on my 4.2.2?

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I run os 4.3, and flycast on my at&t 8310 curve. everything is working just fine. flycast can be a little slow at times, but that's probly my location.