More often then expected - it is necessary to connect to the Filer using SSH or Telnet. Console access using a serial cable is not always an option - nevertheless the NetApp is supporting those interactive session - but with some limitations.
Rooted my Asus a few days after I have received it. A few month later I unlocked the bootloader and here we go :) Made a backup of the original stock ROM with TWRP and using Goo.im I updated to latest CyanogenMod. Everything worked fine - until I restored the stock ROM using my backup.