If you tried to change the keys manually for BeV and still not getting it then u should load the latest operatinal key file onto your receiver.
The latest op key for Viewsat can be found on Totalfta. If it is a .rar file or a .zip file make sure u decompress it.
The reason u r not getting BeV with manaul key entry could be because u accidentally continued entering the keys towards the right half of key section which are filled with zeroes . Even if you re-enter the zeroes back there it might not help. In this case u need to load an op key file.
Even if u dont load the latest op key file u can load any old op key file and then manually change the keys but make sure u dont accidentally enter anything over the zeroes on the right half of the key section.