Lollipop 5.1.1 problems with recovery, super su

Hello guys, im flash my Samsung S3 Neo today, from Rox, its great i really like, but i have some issues, first of all i cant go to recovery mode, it stops on download and thats it, i tried with some app but nothing, seems that super su is not up to date, that is second problem, how to fix it i cant go to recovery. And the last thing when i turn on my device on top of left corner its red text, says: "Kernel is not seandroid forcing", is that some problem or what.
Please help and Thank you.