Don't know the details. But came home to find girlfriend's Samsung S6 active with black screen, she said phone fell off bed, picked it up and had black screen, she did a internet search tried some things, doesn't remember what. Now still black screen, with the words "recovery booting" slowly flashing upper left corner and every one to two minutes a image of android with the words "installing system update " appears for a couple seconds any idea to bring this phone back ?