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If you've a latest software than the TV has now installed, you can do it by an upgrade with that software. As the process goes on, the older version will be deleted. You cannot delete the software by any way. If you wish to get more details, surf the
following link. There are over two thousand and four hundred posts. All are
related to television and other domestic electronic equipment service help. You
can get a solution there. Type in the brand name to your device to its search
box, can be located at the top right of the display window. http://electronicshelponline.blogspot.com/
Enter Samsung site by Googling 'samsung.com/support/downloads/software'. There you can see all the software for samsung devices. you have to spend some time in selecting the approximate software you need. All proceedings to download and install the softwere will be described. OK.
it looks like a faulty mains board. you need to upgrade the tv software with the latest update. if the tv is not accepting the upgrade then it can be a crook mains board. hope it helps! please rate my comments :D