I wonder how many S6 users experiencing non bootable phone after applying May, 2018 security update and what Verizon is doing about it? S6 simply freezes on red Verizon page and stays there forever. None of safe boot options nor cache partition cleanup help. Verizon Service Representative over the phone indicated that many users facing such issue and Verizon is working with Samsung to address it. As phone is not booting up - most likely it will have to be brought into a shop for firmware update over USB cable.