how to update su in recovery mode if Adb and external storage disabled?

[Gerryone]

how to update su in recovery mode if Adb and external storage disabled?note 4, android 5.0.1, rooted successfully.
Installed superuser and it asks for updating su.in recovery mode there are ADB and external storage update options, but that both are desabled.
What should I do?
Thank in advance.

 

[markb323]

download SuperSu its a better superuser app imo and it can update straight from the app no recovery or adb to think about