Please help! Flashing screen in Recovery mode!

I was about to sell my rooted Note 4, and I did a "reset phone" in the settings menu to wipe the data out , so I can sell it. When the phone turned back I saw on the top left a blue "recovery mode" message and the next is my phone black, and on the middle of the screen appear every 5 sec a green android logo with "Installing System update" What a hell happened?I am stuck.. I tried to take the battery out and hold the volume up+home+power on bottoms to get a recovery mode menu, but it does the same flashing screen thing.. Please help me I have a buyer for this phone :(

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