Not really, the last release is gamma8, 2.0.5.6. The fact that you can run these commands and get something resembling 2.1.x is surely not encouraged. With each SFOS release, each ported device has to get itself properly ported. As far as I understand, some packages are provided only via device-specific repos. These packages will not be updated (since they don't exist yet, we have to compile them as a part of porting) if you run update before port is ready. I would suggest to stick to 2.0.5.6 and ask on IRC about the status of the port.