Have you tried kingroot.apk?
Not kingoroot! Two separate programs.
I have tried NewKingrootV4.9.6_C151_B321_en_release_2016_09_18_105203.apk
My Camera is broken. I am wondering if that has any significance. Could the root exploits rely ...
Rooting done with KingoRoot app on LG K4 LTE (k120e).
That did it. Thanks lucky5522 !!!
For the record, if anyone else needs to know, the phone that was rooted was an LG K4 from Verizon, model VS425.