We just found OS 5.0 for curve 8900 out there.
For the time being, here is the link for the OS 5.0 for the Curve 8900. Mind you, it’s a Rapidshare link and no one really knows where these leaks come from. Nothing official, supported or anything. In this case, more than ever, our usual warnings apply.
Please Do With Your Own Risk (DWIYOR)