Finally got ak728. Had to pull the battery 4 times but it finally worked. No idea why this is happening.
I have this same problem. The first few times I see the AK logo and then it glitches out with some vertical lines and then a black screen. ...
I tried it did not work on 4.4.2
Sent from my SAMSUNG-SM-N900A using Tapatalk
Same here. The app says successful but no root on the phone.