USING SENDCOMMAND ON 10E CAN SOFT-BRICK, BUT ALL MAY NOT BE LOST. I managed to get root working on my MetroPCS LG Leon with firmware 10e (Lollipop v5.1.1).
Unlike my experience rooting with 10b, running the lg_root.sh on 10e only created directories and symlinks; no files from the UPDATE-SuperSU-v2.46.zip copied over. So I extracted the armv7 and common folders from the zip and put in /data/local/tmp/ via adb, then from Firmware Download mode I used the SendCommand terminal to manually remount the system read/write and copy the su files to their respective system paths.
A few tips... For me, even though the booting device appeared hung or stuck in bootloop after running lg_root.sh, I was able to still access it from adb and transfer files (JUST DON'T FACTORY DATA RESET)... then I just pulled the battery, and it was back to Firmware Download mode for trial and error in the SendCommand terminal. Manually typing the commands to remount worked, and I was able to copy over all the su files to finish the steps and get root on it. I just had to ensure I also set the permissions on them afterwards
I can expand if anyone is interested. There is definitely the potential to hose things up. Normal warnings follow (e.g., I'm not responsible for your brick). Only experienced users should try.