Hi,
I've installed 6.5.26, gone in twrp and flashed stable SuperSu. So I rebooted but the phone started with a bootloop.
So I restarted again in twrp, flashed again 6.5.26, rebooted again in twrp, flashed LATEST (unstable) SuperSu, performed a Cache/Dalvik Cache clean and rebooted. The phone...