Kingroot Android 5.1.1 ((free)) -

Do download from random forums. Use trusted repositories like APKMirror or the official (but slower) KingRoot.net. For Android 5.1.1, the most stable versions are:

K1 was placed in a dusty drawer. “Too old,” Leo said. “The memory is full. The battery drains. You can’t even run the new apps.” kingroot android 5.1.1