I have the Verizon version of the LG G2 and when I received the device, it was already loaded with 12B firmware. I was able to root the device with ioroot16, install SuperSU, all that jazz... I'm under the impression that I need to use loki flash to flash TWRP onto my device, but when I try to do this through ADB, I get an error saying that my device has a Read-only filesystem. Is there some step that I'm missing in this process? Is loki flash the only way to get TWRP onto my device? or is there some other way?