Every attempt of replacing KingRoot with SuperSU failed. So I tried to remove and readd root using KingRoot and my phone stuck in a bootloop. (It showed the sony screen, then the bootanimation starts but instantanely freezes and the z3c reboots). I took FlashTool and flashed the same firmware I was on, without data wipe. The z3c booted, with a lot of fcs, but it booted. Then I tried again KingRoot + recovery installation and it worked! I rebooted into recovery and installed ad 5.1.1 based rom. After I rebooted the z3c, it was again in a bootloop. Now I flashed the previous firmware again and the z3c is booting. Idk what to think, I'm new to sony "modding world" and everything I'm getting right now is a lot of bootloops