The smartswitch downloading the software very slow. Normally the entire 6GB data download within 1 hr via wifi. But this time almost 1½ hours it just download 35% only that too I connected via ethernet and it's 150mbps connection
The reason behind this is that it downloads the update in packets and every packet is verified before proceeding to the next package, so that there are no issues with the software.
Finally updated the full package. I think the June update only carries the security patch (around 150mb) and other apps including camera doesn't have any changes in the version.