This only because your android phone did not get the root permisson. You will find when you opened the adb shell the prompt is $, like this:
C:\Windows\system32>adb shell
shell@android:/ $
when you get the root persmission, it will change to #:
shell@android:/ #
// How to //
I. What you need to do is to install Superuser Permissions or Kinguser, Superuser or KingRoot App on your phone first.
II. The execute the following commands:
-
adb shell
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su
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click "Allow" on your phone
-
now you will find the $ has changed to #, all done