On the blue screen ''installing system update'' the bar gets to 28% and restarts to the black Samsung Galaxy S7 screen, This happens on a continuous loop. I've tried force restarting and plugging the phone in, these have not worked.
Could you please share more details about how did you solved this problem? What do you mean by connecting to smart switch and after reinstall the update? I have a Galaxy S6 which keeps restarting during the update when is reaching 28%.