Vadi bro but for STB on screen Guide/EPG n for Screen Saver software update needed for change in logo but for all channels it'll automatically change like last time as its done from Uplink centre TN.
I don't think so as last time they changed without giving any SW update. AFAIK it is updated from Uplinking centre and not SW driven change otherwise it would have been updated in one shot but it took time for same being reflected in all channels.
See our old threads discussion