Your Youtube player app give you error but when you at the same time open youtube in browser it start setting played. You will get the solution here see fill post

Now always new update come from Lenovo but if you Root your Lenovo Mobile than rooting lonovo can be done only after changing the Lenovo recovery mod with custom recovery mod.

If you change you Lenovo recovery mod with custom recovery mod and you get android version update , that update required your lenovo recovery mod because that recovery mod only can install the Android update