Start off with 7.5.2.0 (latest stable where SuperSU is still working) and flash SuperSU 2.46. Then dirty flash 8.5.1.0, SuperSU will update automatically upon finished booting.
Start off with 7.5.2.0 (latest stable where SuperSU is still working) and flash SuperSU 2.46. Then dirty flash 8.5.1.0, SuperSU will update automatically upon finished booting.