For those who prefer not using kingo, Saferoot successfully rooted my t-mobile F3 after the recent "b" update.
[ROOT] Saferoot: Root for VRUEMJ7, MK2, and Android 4.3 - xda-developers
It works on any phone with a linux kernel before 3.5.5
[ROOT] Saferoot: Root for VRUEMJ7, MK2, and Android 4.3 - xda-developers
It works on any phone with a linux kernel before 3.5.5