The steps are explain in my post....
Z2 tablet 4.4.2 rooted with easy root tool 12.2 with superSU 2.18
Update 4.4.4 installed via OTA.
Update SuperSU to 2.19 in Google play store
Restart the tablet.
SuperSU binaries must be updated
Restart the tablet.
And check with root checker...and Works. (...