As I understand the procedure for El Cap and Sierra, you have to boot into recovery, disable sip, reboot, and run CAT, which then reboots again. Everything went fine for me until AFTER I ran CAT, when it went into re-boot loop and hung there. I had to boot back into recovery and then start the TM restore. Still running a HDD, so still a couple of hours to go. What a PITA. ???? Did I do something wrong?