Alright, thanks for the explanation. Man I miss my S7, everything was simpler back then...
Dude, as I said in RR forum, I have to say again for other people.. you CAN roll back vendor. You can't roll back firmware, and los can boot and work perfectly with latest brg6 firmware. Keep calm and flash bre5 vendor.
Thanks, but I'm on stock until this problem is solved. The bad part is I have the latest BRG6 firmware (July security patch), and it is not possible to downgrade.Just flashed today and couldn't find the twrp flashable one.
Flash this in AP in ODIN