Default [Q] How to get to stock ROOTed in Cabletech URZ0350 (4.1.1)?

From news device Cabletech have captured the root, but I have a problem that no application type Superuser do not want to use raw files.

The application superuser permissions selects all in green, and the display updated files are raw data file su:

Version: legacy
the ability to update to 3.1.1

When I click the update button it shows the message: "defeat". Why?

The data on your device:

Model: Cabletech URZ0350 (rk30sdk)
OS: Android 4.1.1

Thank you for your attention and best regards.