How cane i root my galaxy s4 i9505 without computer?

I got a problem. I update my galaxy s4 i9505 to android 5.0.1 lolipop. And now my phone from time to time restarts himself, lose a tone, froze display ect... When i decided to downgrade to official 4.4.2 i cannot connect him with computer. When i connect USB cable he just charging i turn on USB debugging and nothing happens. I thry with king root and he display me a note "no root strategy" root master to. What cane i do??? Any advise??? Thanx

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