G3 stuck in boot loop

I had my G3 replaced by verizon after a hardware failure. The new one shipped with 47A, and I attempted to roll back to 10B using the TOT method, but it gave me the dreaded "there is no ks version" error. I checked and it's NOT one of the K revision phones. Anyway, I gave up on flashing it for now but decided to try rooting it with Kingroot. That failed as well. In the meantime I've received the notification to upgrade to 48A and since it kept bugging me about it, I went ahead and told it to upgrade. It failed with an error code and just sat there, unresponsive. So I pulled the battery and now it's stuck in a boot loop. It turns on, vibrates, and shows the LG splash screen. Then it reboots. So it's definitely bricked at the moment. I tried rolling back to 47A with the kdz method, which appeared to work but it's still doing the same thing. Tried the 48A kdz, same effect.

Does anyone have any suggestions or is this thing toast?

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