Now I have understood the problem to some extent
Earlier when any new version was downloaded the download status became to aborted after the update,but now even after updating to latest version 601,it is still continuously showing download status as IDLE,that's the reason it is downloading update again and again on restarting the STB
Is there any way to downgrade the Software to previous variant or reset the STB? :huh :huh
I read in some previous thread of DDF,that reset can be done by pressing right button,bottom button,back and then ok,but this is not working for me