Boot loop after trying to install CM topic

Hello, I could us a little assistance. I was trying to install CM on my new Verizon LG G2 (VS980). I was able to root using ioroot, dump aboot.img, lokify CWM 6.0.4.4, loki_flash the recovery, and boot into CWM. When I tried to sideload the CM 10.2 image, I got some error about unable to lokify boot (it was missing /system/bin/loki.sh). It looks like the problem is that the pre CM 11 images have an old version of loki that fails regularly. It said it had aborted the installation, but something got totally hosed, as when I attempted to reboot, I got into a "secure boot unsuccessful" loop. I've made a verison of the CM 10.2 zip with the latest version of loki_patch and loki_flash, but I can't seem to get into recovery using the buttons (might be doing it wrong as the only time I went into recovery I just did adb reboot recovery) to try flashing another rom or return to stock. I can get in to download mode by holding up during boot, but I don't have easy access to a non-linux machine to use the lg mobile support tool. Is there any way to return to stock without a windows computer?