I was rooted with Kingroot and tried installing Busybox to /system/xbin and also tried moving Superuser to be a system app then rebooted. I really should have known better since I knew about the root issues with 6.0. Now I get the "Secure boot error 1003 modified" message and when I tried the Wipe Data/Factory Reset it only formats user data and doesn't do a full factory reset. Any help? I tried connecting with ADB but it can't find the device.